fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/string.h>
  42 #include <linux/slab.h>
  43 #include <linux/sunrpc/clnt.h>
  44 #include <linux/sunrpc/gss_api.h>
  45 #include <linux/nfs.h>
  46 #include <linux/nfs4.h>
  47 #include <linux/nfs_fs.h>
  48 #include <linux/nfs_page.h>
  49 #include <linux/nfs_mount.h>
  50 #include <linux/namei.h>
  51 #include <linux/mount.h>
  52 #include <linux/module.h>
  53 #include <linux/sunrpc/bc_xprt.h>
  54 #include <linux/xattr.h>
  55 #include <linux/utsname.h>
  56
  57 #include "nfs4_fs.h"
  58 #include "delegation.h"
  59 #include "internal.h"
  60 #include "iostat.h"
  61 #include "callback.h"
  62 #include "pnfs.h"
  63
  64 #define NFSDBG_FACILITY         NFSDBG_PROC
  65
  66 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  67 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  68
  69 #define NFS4_MAX_LOOP_ON_RECOVER (10)
  70
  71 struct nfs4_opendata;
  72 static int _nfs4_proc_open(struct nfs4_opendata *data);
  73 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  74 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  75 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  76 static int _nfs4_proc_lookup(struct rpc_clnt *client, struct inode *dir,
  77                              const struct qstr *name, struct nfs_fh *fhandle,
  78                              struct nfs_fattr *fattr);
  79 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  80 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  81                             struct nfs_fattr *fattr, struct iattr *sattr,
  82                             struct nfs4_state *state);
  83
  84 /* Prevent leaks of NFSv4 errors into userland */
  85 static int nfs4_map_errors(int err)
  86 {
  87         if (err >= -1000)
  88                 return err;
  89         switch (err) {
  90         case -NFS4ERR_RESOURCE:
  91                 return -EREMOTEIO;
  92         case -NFS4ERR_WRONGSEC:
  93                 return -EPERM;
  94         case -NFS4ERR_BADOWNER:
  95         case -NFS4ERR_BADNAME:
  96                 return -EINVAL;
  97         default:
  98                 dprintk("%s could not handle NFSv4 error %d\n",
  99                                 __func__, -err);
 100                 break;
 101         }
 102         return -EIO;
 103 }
 104
 105 /*
 106  * This is our standard bitmap for GETATTR requests.
 107  */
 108 const u32 nfs4_fattr_bitmap[2] = {
 109         FATTR4_WORD0_TYPE
 110         | FATTR4_WORD0_CHANGE
 111         | FATTR4_WORD0_SIZE
 112         | FATTR4_WORD0_FSID
 113         | FATTR4_WORD0_FILEID,
 114         FATTR4_WORD1_MODE
 115         | FATTR4_WORD1_NUMLINKS
 116         | FATTR4_WORD1_OWNER
 117         | FATTR4_WORD1_OWNER_GROUP
 118         | FATTR4_WORD1_RAWDEV
 119         | FATTR4_WORD1_SPACE_USED
 120         | FATTR4_WORD1_TIME_ACCESS
 121         | FATTR4_WORD1_TIME_METADATA
 122         | FATTR4_WORD1_TIME_MODIFY
 123 };
 124
 125 const u32 nfs4_statfs_bitmap[2] = {
 126         FATTR4_WORD0_FILES_AVAIL
 127         | FATTR4_WORD0_FILES_FREE
 128         | FATTR4_WORD0_FILES_TOTAL,
 129         FATTR4_WORD1_SPACE_AVAIL
 130         | FATTR4_WORD1_SPACE_FREE
 131         | FATTR4_WORD1_SPACE_TOTAL
 132 };
 133
 134 const u32 nfs4_pathconf_bitmap[2] = {
 135         FATTR4_WORD0_MAXLINK
 136         | FATTR4_WORD0_MAXNAME,
 137         0
 138 };
 139
 140 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 141                         | FATTR4_WORD0_MAXREAD
 142                         | FATTR4_WORD0_MAXWRITE
 143                         | FATTR4_WORD0_LEASE_TIME,
 144                         FATTR4_WORD1_TIME_DELTA
 145                         | FATTR4_WORD1_FS_LAYOUT_TYPES
 146 };
 147
 148 const u32 nfs4_fs_locations_bitmap[2] = {
 149         FATTR4_WORD0_TYPE
 150         | FATTR4_WORD0_CHANGE
 151         | FATTR4_WORD0_SIZE
 152         | FATTR4_WORD0_FSID
 153         | FATTR4_WORD0_FILEID
 154         | FATTR4_WORD0_FS_LOCATIONS,
 155         FATTR4_WORD1_MODE
 156         | FATTR4_WORD1_NUMLINKS
 157         | FATTR4_WORD1_OWNER
 158         | FATTR4_WORD1_OWNER_GROUP
 159         | FATTR4_WORD1_RAWDEV
 160         | FATTR4_WORD1_SPACE_USED
 161         | FATTR4_WORD1_TIME_ACCESS
 162         | FATTR4_WORD1_TIME_METADATA
 163         | FATTR4_WORD1_TIME_MODIFY
 164         | FATTR4_WORD1_MOUNTED_ON_FILEID
 165 };
 166
 167 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 168                 struct nfs4_readdir_arg *readdir)
 169 {
 170         __be32 *start, *p;
 171
 172         BUG_ON(readdir->count < 80);
 173         if (cookie > 2) {
 174                 readdir->cookie = cookie;
 175                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 176                 return;
 177         }
 178
 179         readdir->cookie = 0;
 180         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 181         if (cookie == 2)
 182                 return;
 183
 184         /*
 185          * NFSv4 servers do not return entries for '.' and '..'
 186          * Therefore, we fake these entries here.  We let '.'
 187          * have cookie 0 and '..' have cookie 1.  Note that
 188          * when talking to the server, we always send cookie 0
 189          * instead of 1 or 2.
 190          */
 191         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 192
 193         if (cookie == 0) {
 194                 *p++ = xdr_one;                                  /* next */
 195                 *p++ = xdr_zero;                   /* cookie, first word */
 196                 *p++ = xdr_one;                   /* cookie, second word */
 197                 *p++ = xdr_one;                             /* entry len */
 198                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 199                 p++;
 200                 *p++ = xdr_one;                         /* bitmap length */
 201                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 202                 *p++ = htonl(8);              /* attribute buffer length */
 203                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 204         }
 205
 206         *p++ = xdr_one;                                  /* next */
 207         *p++ = xdr_zero;                   /* cookie, first word */
 208         *p++ = xdr_two;                   /* cookie, second word */
 209         *p++ = xdr_two;                             /* entry len */
 210         memcpy(p, "..\0\0", 4);                         /* entry */
 211         p++;
 212         *p++ = xdr_one;                         /* bitmap length */
 213         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 214         *p++ = htonl(8);              /* attribute buffer length */
 215         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 216
 217         readdir->pgbase = (char *)p - (char *)start;
 218         readdir->count -= readdir->pgbase;
 219         kunmap_atomic(start, KM_USER0);
 220 }
 221
 222 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 223 {
 224         int res;
 225
 226         might_sleep();
 227
 228         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 229                         nfs_wait_bit_killable, TASK_KILLABLE);
 230         return res;
 231 }
 232
 233 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 234 {
 235         int res = 0;
 236
 237         might_sleep();
 238
 239         if (*timeout <= 0)
 240                 *timeout = NFS4_POLL_RETRY_MIN;
 241         if (*timeout > NFS4_POLL_RETRY_MAX)
 242                 *timeout = NFS4_POLL_RETRY_MAX;
 243         schedule_timeout_killable(*timeout);
 244         if (fatal_signal_pending(current))
 245                 res = -ERESTARTSYS;
 246         *timeout <<= 1;
 247         return res;
 248 }
 249
 250 /* This is the error handling routine for processes that are allowed
 251  * to sleep.
 252  */
 253 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 254 {
 255         struct nfs_client *clp = server->nfs_client;
 256         struct nfs4_state *state = exception->state;
 257         int ret = errorcode;
 258
 259         exception->retry = 0;
 260         switch(errorcode) {
 261                 case 0:
 262                         return 0;
 263                 case -NFS4ERR_ADMIN_REVOKED:
 264                 case -NFS4ERR_BAD_STATEID:
 265                 case -NFS4ERR_OPENMODE:
 266                         if (state == NULL)
 267                                 break;
 268                         nfs4_schedule_stateid_recovery(server, state);
 269                         goto wait_on_recovery;
 270                 case -NFS4ERR_EXPIRED:
 271                         if (state != NULL)
 272                                 nfs4_schedule_stateid_recovery(server, state);
 273                 case -NFS4ERR_STALE_STATEID:
 274                 case -NFS4ERR_STALE_CLIENTID:
 275                         nfs4_schedule_lease_recovery(clp);
 276                         goto wait_on_recovery;
 277 #if defined(CONFIG_NFS_V4_1)
 278                 case -NFS4ERR_BADSESSION:
 279                 case -NFS4ERR_BADSLOT:
 280                 case -NFS4ERR_BAD_HIGH_SLOT:
 281                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 282                 case -NFS4ERR_DEADSESSION:
 283                 case -NFS4ERR_SEQ_FALSE_RETRY:
 284                 case -NFS4ERR_SEQ_MISORDERED:
 285                         dprintk("%s ERROR: %d Reset session\n", __func__,
 286                                 errorcode);
 287                         nfs4_schedule_session_recovery(clp->cl_session);
 288                         exception->retry = 1;
 289                         break;
 290 #endif /* defined(CONFIG_NFS_V4_1) */
 291                 case -NFS4ERR_FILE_OPEN:
 292                         if (exception->timeout > HZ) {
 293                                 /* We have retried a decent amount, time to
 294                                  * fail
 295                                  */
 296                                 ret = -EBUSY;
 297                                 break;
 298                         }
 299                 case -NFS4ERR_GRACE:
 300                 case -NFS4ERR_DELAY:
 301                 case -EKEYEXPIRED:
 302                         ret = nfs4_delay(server->client, &exception->timeout);
 303                         if (ret != 0)
 304                                 break;
 305                 case -NFS4ERR_RETRY_UNCACHED_REP:
 306                 case -NFS4ERR_OLD_STATEID:
 307                         exception->retry = 1;
 308                         break;
 309                 case -NFS4ERR_BADOWNER:
 310                         /* The following works around a Linux server bug! */
 311                 case -NFS4ERR_BADNAME:
 312                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 313                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 314                                 exception->retry = 1;
 315                                 printk(KERN_WARNING "NFS: v4 server %s "
 316                                                 "does not accept raw "
 317                                                 "uid/gids. "
 318                                                 "Reenabling the idmapper.\n",
 319                                                 server->nfs_client->cl_hostname);
 320                         }
 321         }
 322         /* We failed to handle the error */
 323         return nfs4_map_errors(ret);
 324 wait_on_recovery:
 325         ret = nfs4_wait_clnt_recover(clp);
 326         if (ret == 0)
 327                 exception->retry = 1;
 328         return ret;
 329 }
 330
 331
 332 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 333 {
 334         spin_lock(&clp->cl_lock);
 335         if (time_before(clp->cl_last_renewal,timestamp))
 336                 clp->cl_last_renewal = timestamp;
 337         spin_unlock(&clp->cl_lock);
 338 }
 339
 340 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 341 {
 342         do_renew_lease(server->nfs_client, timestamp);
 343 }
 344
 345 #if defined(CONFIG_NFS_V4_1)
 346
 347 /*
 348  * nfs4_free_slot - free a slot and efficiently update slot table.
 349  *
 350  * freeing a slot is trivially done by clearing its respective bit
 351  * in the bitmap.
 352  * If the freed slotid equals highest_used_slotid we want to update it
 353  * so that the server would be able to size down the slot table if needed,
 354  * otherwise we know that the highest_used_slotid is still in use.
 355  * When updating highest_used_slotid there may be "holes" in the bitmap
 356  * so we need to scan down from highest_used_slotid to 0 looking for the now
 357  * highest slotid in use.
 358  * If none found, highest_used_slotid is set to -1.
 359  *
 360  * Must be called while holding tbl->slot_tbl_lock
 361  */
 362 static void
 363 nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *free_slot)
 364 {
 365         int free_slotid = free_slot - tbl->slots;
 366         int slotid = free_slotid;
 367
 368         BUG_ON(slotid < 0 || slotid >= NFS4_MAX_SLOT_TABLE);
 369         /* clear used bit in bitmap */
 370         __clear_bit(slotid, tbl->used_slots);
 371
 372         /* update highest_used_slotid when it is freed */
 373         if (slotid == tbl->highest_used_slotid) {
 374                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 375                 if (slotid < tbl->max_slots)
 376                         tbl->highest_used_slotid = slotid;
 377                 else
 378                         tbl->highest_used_slotid = -1;
 379         }
 380         dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
 381                 free_slotid, tbl->highest_used_slotid);
 382 }
 383
 384 /*
 385  * Signal state manager thread if session fore channel is drained
 386  */
 387 static void nfs4_check_drain_fc_complete(struct nfs4_session *ses)
 388 {
 389         struct rpc_task *task;
 390
 391         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 392                 task = rpc_wake_up_next(&ses->fc_slot_table.slot_tbl_waitq);
 393                 if (task)
 394                         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 395                 return;
 396         }
 397
 398         if (ses->fc_slot_table.highest_used_slotid != -1)
 399                 return;
 400
 401         dprintk("%s COMPLETE: Session Fore Channel Drained\n", __func__);
 402         complete(&ses->fc_slot_table.complete);
 403 }
 404
 405 /*
 406  * Signal state manager thread if session back channel is drained
 407  */
 408 void nfs4_check_drain_bc_complete(struct nfs4_session *ses)
 409 {
 410         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state) ||
 411             ses->bc_slot_table.highest_used_slotid != -1)
 412                 return;
 413         dprintk("%s COMPLETE: Session Back Channel Drained\n", __func__);
 414         complete(&ses->bc_slot_table.complete);
 415 }
 416
 417 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 418 {
 419         struct nfs4_slot_table *tbl;
 420
 421         tbl = &res->sr_session->fc_slot_table;
 422         if (!res->sr_slot) {
 423                 /* just wake up the next guy waiting since
 424                  * we may have not consumed a slot after all */
 425                 dprintk("%s: No slot\n", __func__);
 426                 return;
 427         }
 428
 429         spin_lock(&tbl->slot_tbl_lock);
 430         nfs4_free_slot(tbl, res->sr_slot);
 431         nfs4_check_drain_fc_complete(res->sr_session);
 432         spin_unlock(&tbl->slot_tbl_lock);
 433         res->sr_slot = NULL;
 434 }
 435
 436 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 437 {
 438         unsigned long timestamp;
 439         struct nfs_client *clp;
 440
 441         /*
 442          * sr_status remains 1 if an RPC level error occurred. The server
 443          * may or may not have processed the sequence operation..
 444          * Proceed as if the server received and processed the sequence
 445          * operation.
 446          */
 447         if (res->sr_status == 1)
 448                 res->sr_status = NFS_OK;
 449
 450         /* don't increment the sequence number if the task wasn't sent */
 451         if (!RPC_WAS_SENT(task))
 452                 goto out;
 453
 454         /* Check the SEQUENCE operation status */
 455         switch (res->sr_status) {
 456         case 0:
 457                 /* Update the slot's sequence and clientid lease timer */
 458                 ++res->sr_slot->seq_nr;
 459                 timestamp = res->sr_renewal_time;
 460                 clp = res->sr_session->clp;
 461                 do_renew_lease(clp, timestamp);
 462                 /* Check sequence flags */
 463                 if (res->sr_status_flags != 0)
 464                         nfs4_schedule_lease_recovery(clp);
 465                 break;
 466         case -NFS4ERR_DELAY:
 467                 /* The server detected a resend of the RPC call and
 468                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 469                  * of RFC5661.
 470                  */
 471                 dprintk("%s: slot=%td seq=%d: Operation in progress\n",
 472                         __func__,
 473                         res->sr_slot - res->sr_session->fc_slot_table.slots,
 474                         res->sr_slot->seq_nr);
 475                 goto out_retry;
 476         default:
 477                 /* Just update the slot sequence no. */
 478                 ++res->sr_slot->seq_nr;
 479         }
 480 out:
 481         /* The session may be reset by one of the error handlers. */
 482         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 483         nfs41_sequence_free_slot(res);
 484         return 1;
 485 out_retry:
 486         if (!rpc_restart_call(task))
 487                 goto out;
 488         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 489         return 0;
 490 }
 491
 492 static int nfs4_sequence_done(struct rpc_task *task,
 493                                struct nfs4_sequence_res *res)
 494 {
 495         if (res->sr_session == NULL)
 496                 return 1;
 497         return nfs41_sequence_done(task, res);
 498 }
 499
 500 /*
 501  * nfs4_find_slot - efficiently look for a free slot
 502  *
 503  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 504  * If found, we mark the slot as used, update the highest_used_slotid,
 505  * and respectively set up the sequence operation args.
 506  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
 507  *
 508  * Note: must be called with under the slot_tbl_lock.
 509  */
 510 static u8
 511 nfs4_find_slot(struct nfs4_slot_table *tbl)
 512 {
 513         int slotid;
 514         u8 ret_id = NFS4_MAX_SLOT_TABLE;
 515         BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
 516
 517         dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
 518                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 519                 tbl->max_slots);
 520         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 521         if (slotid >= tbl->max_slots)
 522                 goto out;
 523         __set_bit(slotid, tbl->used_slots);
 524         if (slotid > tbl->highest_used_slotid)
 525                 tbl->highest_used_slotid = slotid;
 526         ret_id = slotid;
 527 out:
 528         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 529                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 530         return ret_id;
 531 }
 532
 533 int nfs41_setup_sequence(struct nfs4_session *session,
 534                                 struct nfs4_sequence_args *args,
 535                                 struct nfs4_sequence_res *res,
 536                                 int cache_reply,
 537                                 struct rpc_task *task)
 538 {
 539         struct nfs4_slot *slot;
 540         struct nfs4_slot_table *tbl;
 541         u8 slotid;
 542
 543         dprintk("--> %s\n", __func__);
 544         /* slot already allocated? */
 545         if (res->sr_slot != NULL)
 546                 return 0;
 547
 548         tbl = &session->fc_slot_table;
 549
 550         spin_lock(&tbl->slot_tbl_lock);
 551         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 552             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 553                 /*
 554                  * The state manager will wait until the slot table is empty.
 555                  * Schedule the reset thread
 556                  */
 557                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 558                 spin_unlock(&tbl->slot_tbl_lock);
 559                 dprintk("%s Schedule Session Reset\n", __func__);
 560                 return -EAGAIN;
 561         }
 562
 563         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 564             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 565                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 566                 spin_unlock(&tbl->slot_tbl_lock);
 567                 dprintk("%s enforce FIFO order\n", __func__);
 568                 return -EAGAIN;
 569         }
 570
 571         slotid = nfs4_find_slot(tbl);
 572         if (slotid == NFS4_MAX_SLOT_TABLE) {
 573                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 574                 spin_unlock(&tbl->slot_tbl_lock);
 575                 dprintk("<-- %s: no free slots\n", __func__);
 576                 return -EAGAIN;
 577         }
 578         spin_unlock(&tbl->slot_tbl_lock);
 579
 580         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 581         slot = tbl->slots + slotid;
 582         args->sa_session = session;
 583         args->sa_slotid = slotid;
 584         args->sa_cache_this = cache_reply;
 585
 586         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 587
 588         res->sr_session = session;
 589         res->sr_slot = slot;
 590         res->sr_renewal_time = jiffies;
 591         res->sr_status_flags = 0;
 592         /*
 593          * sr_status is only set in decode_sequence, and so will remain
 594          * set to 1 if an rpc level failure occurs.
 595          */
 596         res->sr_status = 1;
 597         return 0;
 598 }
 599 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 600
 601 int nfs4_setup_sequence(const struct nfs_server *server,
 602                         struct nfs4_sequence_args *args,
 603                         struct nfs4_sequence_res *res,
 604                         int cache_reply,
 605                         struct rpc_task *task)
 606 {
 607         struct nfs4_session *session = nfs4_get_session(server);
 608         int ret = 0;
 609
 610         if (session == NULL) {
 611                 args->sa_session = NULL;
 612                 res->sr_session = NULL;
 613                 goto out;
 614         }
 615
 616         dprintk("--> %s clp %p session %p sr_slot %td\n",
 617                 __func__, session->clp, session, res->sr_slot ?
 618                         res->sr_slot - session->fc_slot_table.slots : -1);
 619
 620         ret = nfs41_setup_sequence(session, args, res, cache_reply,
 621                                    task);
 622 out:
 623         dprintk("<-- %s status=%d\n", __func__, ret);
 624         return ret;
 625 }
 626
 627 struct nfs41_call_sync_data {
 628         const struct nfs_server *seq_server;
 629         struct nfs4_sequence_args *seq_args;
 630         struct nfs4_sequence_res *seq_res;
 631         int cache_reply;
 632 };
 633
 634 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 635 {
 636         struct nfs41_call_sync_data *data = calldata;
 637
 638         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 639
 640         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 641                                 data->seq_res, data->cache_reply, task))
 642                 return;
 643         rpc_call_start(task);
 644 }
 645
 646 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 647 {
 648         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 649         nfs41_call_sync_prepare(task, calldata);
 650 }
 651
 652 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 653 {
 654         struct nfs41_call_sync_data *data = calldata;
 655
 656         nfs41_sequence_done(task, data->seq_res);
 657 }
 658
 659 struct rpc_call_ops nfs41_call_sync_ops = {
 660         .rpc_call_prepare = nfs41_call_sync_prepare,
 661         .rpc_call_done = nfs41_call_sync_done,
 662 };
 663
 664 struct rpc_call_ops nfs41_call_priv_sync_ops = {
 665         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 666         .rpc_call_done = nfs41_call_sync_done,
 667 };
 668
 669 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 670                                    struct nfs_server *server,
 671                                    struct rpc_message *msg,
 672                                    struct nfs4_sequence_args *args,
 673                                    struct nfs4_sequence_res *res,
 674                                    int cache_reply,
 675                                    int privileged)
 676 {
 677         int ret;
 678         struct rpc_task *task;
 679         struct nfs41_call_sync_data data = {
 680                 .seq_server = server,
 681                 .seq_args = args,
 682                 .seq_res = res,
 683                 .cache_reply = cache_reply,
 684         };
 685         struct rpc_task_setup task_setup = {
 686                 .rpc_client = clnt,
 687                 .rpc_message = msg,
 688                 .callback_ops = &nfs41_call_sync_ops,
 689                 .callback_data = &data
 690         };
 691
 692         res->sr_slot = NULL;
 693         if (privileged)
 694                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 695         task = rpc_run_task(&task_setup);
 696         if (IS_ERR(task))
 697                 ret = PTR_ERR(task);
 698         else {
 699                 ret = task->tk_status;
 700                 rpc_put_task(task);
 701         }
 702         return ret;
 703 }
 704
 705 int _nfs4_call_sync_session(struct rpc_clnt *clnt,
 706                             struct nfs_server *server,
 707                             struct rpc_message *msg,
 708                             struct nfs4_sequence_args *args,
 709                             struct nfs4_sequence_res *res,
 710                             int cache_reply)
 711 {
 712         return nfs4_call_sync_sequence(clnt, server, msg, args, res, cache_reply, 0);
 713 }
 714
 715 #else
 716 static int nfs4_sequence_done(struct rpc_task *task,
 717                                struct nfs4_sequence_res *res)
 718 {
 719         return 1;
 720 }
 721 #endif /* CONFIG_NFS_V4_1 */
 722
 723 int _nfs4_call_sync(struct rpc_clnt *clnt,
 724                     struct nfs_server *server,
 725                     struct rpc_message *msg,
 726                     struct nfs4_sequence_args *args,
 727                     struct nfs4_sequence_res *res,
 728                     int cache_reply)
 729 {
 730         args->sa_session = res->sr_session = NULL;
 731         return rpc_call_sync(clnt, msg, 0);
 732 }
 733
 734 static inline
 735 int nfs4_call_sync(struct rpc_clnt *clnt,
 736                    struct nfs_server *server,
 737                    struct rpc_message *msg,
 738                    struct nfs4_sequence_args *args,
 739                    struct nfs4_sequence_res *res,
 740                    int cache_reply)
 741 {
 742         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 743                                                 args, res, cache_reply);
 744 }
 745
 746 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 747 {
 748         struct nfs_inode *nfsi = NFS_I(dir);
 749
 750         spin_lock(&dir->i_lock);
 751         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 752         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 753                 nfs_force_lookup_revalidate(dir);
 754         nfsi->change_attr = cinfo->after;
 755         spin_unlock(&dir->i_lock);
 756 }
 757
 758 struct nfs4_opendata {
 759         struct kref kref;
 760         struct nfs_openargs o_arg;
 761         struct nfs_openres o_res;
 762         struct nfs_open_confirmargs c_arg;
 763         struct nfs_open_confirmres c_res;
 764         struct nfs_fattr f_attr;
 765         struct nfs_fattr dir_attr;
 766         struct path path;
 767         struct dentry *dir;
 768         struct nfs4_state_owner *owner;
 769         struct nfs4_state *state;
 770         struct iattr attrs;
 771         unsigned long timestamp;
 772         unsigned int rpc_done : 1;
 773         int rpc_status;
 774         int cancelled;
 775 };
 776
 777
 778 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 779 {
 780         p->o_res.f_attr = &p->f_attr;
 781         p->o_res.dir_attr = &p->dir_attr;
 782         p->o_res.seqid = p->o_arg.seqid;
 783         p->c_res.seqid = p->c_arg.seqid;
 784         p->o_res.server = p->o_arg.server;
 785         nfs_fattr_init(&p->f_attr);
 786         nfs_fattr_init(&p->dir_attr);
 787 }
 788
 789 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 790                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 791                 const struct iattr *attrs,
 792                 gfp_t gfp_mask)
 793 {
 794         struct dentry *parent = dget_parent(path->dentry);
 795         struct inode *dir = parent->d_inode;
 796         struct nfs_server *server = NFS_SERVER(dir);
 797         struct nfs4_opendata *p;
 798
 799         p = kzalloc(sizeof(*p), gfp_mask);
 800         if (p == NULL)
 801                 goto err;
 802         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 803         if (p->o_arg.seqid == NULL)
 804                 goto err_free;
 805         path_get(path);
 806         p->path = *path;
 807         p->dir = parent;
 808         p->owner = sp;
 809         atomic_inc(&sp->so_count);
 810         p->o_arg.fh = NFS_FH(dir);
 811         p->o_arg.open_flags = flags;
 812         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 813         p->o_arg.clientid = server->nfs_client->cl_clientid;
 814         p->o_arg.id = sp->so_owner_id.id;
 815         p->o_arg.name = &p->path.dentry->d_name;
 816         p->o_arg.server = server;
 817         p->o_arg.bitmask = server->attr_bitmask;
 818         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 819         if (flags & O_CREAT) {
 820                 u32 *s;
 821
 822                 p->o_arg.u.attrs = &p->attrs;
 823                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 824                 s = (u32 *) p->o_arg.u.verifier.data;
 825                 s[0] = jiffies;
 826                 s[1] = current->pid;
 827         }
 828         p->c_arg.fh = &p->o_res.fh;
 829         p->c_arg.stateid = &p->o_res.stateid;
 830         p->c_arg.seqid = p->o_arg.seqid;
 831         nfs4_init_opendata_res(p);
 832         kref_init(&p->kref);
 833         return p;
 834 err_free:
 835         kfree(p);
 836 err:
 837         dput(parent);
 838         return NULL;
 839 }
 840
 841 static void nfs4_opendata_free(struct kref *kref)
 842 {
 843         struct nfs4_opendata *p = container_of(kref,
 844                         struct nfs4_opendata, kref);
 845
 846         nfs_free_seqid(p->o_arg.seqid);
 847         if (p->state != NULL)
 848                 nfs4_put_open_state(p->state);
 849         nfs4_put_state_owner(p->owner);
 850         dput(p->dir);
 851         path_put(&p->path);
 852         kfree(p);
 853 }
 854
 855 static void nfs4_opendata_put(struct nfs4_opendata *p)
 856 {
 857         if (p != NULL)
 858                 kref_put(&p->kref, nfs4_opendata_free);
 859 }
 860
 861 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 862 {
 863         int ret;
 864
 865         ret = rpc_wait_for_completion_task(task);
 866         return ret;
 867 }
 868
 869 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 870 {
 871         int ret = 0;
 872
 873         if (open_mode & O_EXCL)
 874                 goto out;
 875         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 876                 case FMODE_READ:
 877                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 878                                 && state->n_rdonly != 0;
 879                         break;
 880                 case FMODE_WRITE:
 881                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 882                                 && state->n_wronly != 0;
 883                         break;
 884                 case FMODE_READ|FMODE_WRITE:
 885                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 886                                 && state->n_rdwr != 0;
 887         }
 888 out:
 889         return ret;
 890 }
 891
 892 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 893 {
 894         if ((delegation->type & fmode) != fmode)
 895                 return 0;
 896         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 897                 return 0;
 898         nfs_mark_delegation_referenced(delegation);
 899         return 1;
 900 }
 901
 902 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 903 {
 904         switch (fmode) {
 905                 case FMODE_WRITE:
 906                         state->n_wronly++;
 907                         break;
 908                 case FMODE_READ:
 909                         state->n_rdonly++;
 910                         break;
 911                 case FMODE_READ|FMODE_WRITE:
 912                         state->n_rdwr++;
 913         }
 914         nfs4_state_set_mode_locked(state, state->state | fmode);
 915 }
 916
 917 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 918 {
 919         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 920                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 921         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 922         switch (fmode) {
 923                 case FMODE_READ:
 924                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 925                         break;
 926                 case FMODE_WRITE:
 927                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 928                         break;
 929                 case FMODE_READ|FMODE_WRITE:
 930                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 931         }
 932 }
 933
 934 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 935 {
 936         write_seqlock(&state->seqlock);
 937         nfs_set_open_stateid_locked(state, stateid, fmode);
 938         write_sequnlock(&state->seqlock);
 939 }
 940
 941 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 942 {
 943         /*
 944          * Protect the call to nfs4_state_set_mode_locked and
 945          * serialise the stateid update
 946          */
 947         write_seqlock(&state->seqlock);
 948         if (deleg_stateid != NULL) {
 949                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 950                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 951         }
 952         if (open_stateid != NULL)
 953                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 954         write_sequnlock(&state->seqlock);
 955         spin_lock(&state->owner->so_lock);
 956         update_open_stateflags(state, fmode);
 957         spin_unlock(&state->owner->so_lock);
 958 }
 959
 960 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 961 {
 962         struct nfs_inode *nfsi = NFS_I(state->inode);
 963         struct nfs_delegation *deleg_cur;
 964         int ret = 0;
 965
 966         fmode &= (FMODE_READ|FMODE_WRITE);
 967
 968         rcu_read_lock();
 969         deleg_cur = rcu_dereference(nfsi->delegation);
 970         if (deleg_cur == NULL)
 971                 goto no_delegation;
 972
 973         spin_lock(&deleg_cur->lock);
 974         if (nfsi->delegation != deleg_cur ||
 975             (deleg_cur->type & fmode) != fmode)
 976                 goto no_delegation_unlock;
 977
 978         if (delegation == NULL)
 979                 delegation = &deleg_cur->stateid;
 980         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
 981                 goto no_delegation_unlock;
 982
 983         nfs_mark_delegation_referenced(deleg_cur);
 984         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 985         ret = 1;
 986 no_delegation_unlock:
 987         spin_unlock(&deleg_cur->lock);
 988 no_delegation:
 989         rcu_read_unlock();
 990
 991         if (!ret && open_stateid != NULL) {
 992                 __update_open_stateid(state, open_stateid, NULL, fmode);
 993                 ret = 1;
 994         }
 995
 996         return ret;
 997 }
 998
 999
1000 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1001 {
1002         struct nfs_delegation *delegation;
1003
1004         rcu_read_lock();
1005         delegation = rcu_dereference(NFS_I(inode)->delegation);
1006         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1007                 rcu_read_unlock();
1008                 return;
1009         }
1010         rcu_read_unlock();
1011         nfs_inode_return_delegation(inode);
1012 }
1013
1014 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1015 {
1016         struct nfs4_state *state = opendata->state;
1017         struct nfs_inode *nfsi = NFS_I(state->inode);
1018         struct nfs_delegation *delegation;
1019         int open_mode = opendata->o_arg.open_flags & O_EXCL;
1020         fmode_t fmode = opendata->o_arg.fmode;
1021         nfs4_stateid stateid;
1022         int ret = -EAGAIN;
1023
1024         for (;;) {
1025                 if (can_open_cached(state, fmode, open_mode)) {
1026                         spin_lock(&state->owner->so_lock);
1027                         if (can_open_cached(state, fmode, open_mode)) {
1028                                 update_open_stateflags(state, fmode);
1029                                 spin_unlock(&state->owner->so_lock);
1030                                 goto out_return_state;
1031                         }
1032                         spin_unlock(&state->owner->so_lock);
1033                 }
1034                 rcu_read_lock();
1035                 delegation = rcu_dereference(nfsi->delegation);
1036                 if (delegation == NULL ||
1037                     !can_open_delegated(delegation, fmode)) {
1038                         rcu_read_unlock();
1039                         break;
1040                 }
1041                 /* Save the delegation */
1042                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
1043                 rcu_read_unlock();
1044                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1045                 if (ret != 0)
1046                         goto out;
1047                 ret = -EAGAIN;
1048
1049                 /* Try to update the stateid using the delegation */
1050                 if (update_open_stateid(state, NULL, &stateid, fmode))
1051                         goto out_return_state;
1052         }
1053 out:
1054         return ERR_PTR(ret);
1055 out_return_state:
1056         atomic_inc(&state->count);
1057         return state;
1058 }
1059
1060 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1061 {
1062         struct inode *inode;
1063         struct nfs4_state *state = NULL;
1064         struct nfs_delegation *delegation;
1065         int ret;
1066
1067         if (!data->rpc_done) {
1068                 state = nfs4_try_open_cached(data);
1069                 goto out;
1070         }
1071
1072         ret = -EAGAIN;
1073         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1074                 goto err;
1075         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1076         ret = PTR_ERR(inode);
1077         if (IS_ERR(inode))
1078                 goto err;
1079         ret = -ENOMEM;
1080         state = nfs4_get_open_state(inode, data->owner);
1081         if (state == NULL)
1082                 goto err_put_inode;
1083         if (data->o_res.delegation_type != 0) {
1084                 int delegation_flags = 0;
1085
1086                 rcu_read_lock();
1087                 delegation = rcu_dereference(NFS_I(inode)->delegation);
1088                 if (delegation)
1089                         delegation_flags = delegation->flags;
1090                 rcu_read_unlock();
1091                 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1092                         nfs_inode_set_delegation(state->inode,
1093                                         data->owner->so_cred,
1094                                         &data->o_res);
1095                 else
1096                         nfs_inode_reclaim_delegation(state->inode,
1097                                         data->owner->so_cred,
1098                                         &data->o_res);
1099         }
1100
1101         update_open_stateid(state, &data->o_res.stateid, NULL,
1102                         data->o_arg.fmode);
1103         iput(inode);
1104 out:
1105         return state;
1106 err_put_inode:
1107         iput(inode);
1108 err:
1109         return ERR_PTR(ret);
1110 }
1111
1112 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1113 {
1114         struct nfs_inode *nfsi = NFS_I(state->inode);
1115         struct nfs_open_context *ctx;
1116
1117         spin_lock(&state->inode->i_lock);
1118         list_for_each_entry(ctx, &nfsi->open_files, list) {
1119                 if (ctx->state != state)
1120                         continue;
1121                 get_nfs_open_context(ctx);
1122                 spin_unlock(&state->inode->i_lock);
1123                 return ctx;
1124         }
1125         spin_unlock(&state->inode->i_lock);
1126         return ERR_PTR(-ENOENT);
1127 }
1128
1129 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1130 {
1131         struct nfs4_opendata *opendata;
1132
1133         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, 0, NULL, GFP_NOFS);
1134         if (opendata == NULL)
1135                 return ERR_PTR(-ENOMEM);
1136         opendata->state = state;
1137         atomic_inc(&state->count);
1138         return opendata;
1139 }
1140
1141 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1142 {
1143         struct nfs4_state *newstate;
1144         int ret;
1145
1146         opendata->o_arg.open_flags = 0;
1147         opendata->o_arg.fmode = fmode;
1148         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1149         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1150         nfs4_init_opendata_res(opendata);
1151         ret = _nfs4_recover_proc_open(opendata);
1152         if (ret != 0)
1153                 return ret;
1154         newstate = nfs4_opendata_to_nfs4_state(opendata);
1155         if (IS_ERR(newstate))
1156                 return PTR_ERR(newstate);
1157         nfs4_close_state(&opendata->path, newstate, fmode);
1158         *res = newstate;
1159         return 0;
1160 }
1161
1162 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1163 {
1164         struct nfs4_state *newstate;
1165         int ret;
1166
1167         /* memory barrier prior to reading state->n_* */
1168         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1169         smp_rmb();
1170         if (state->n_rdwr != 0) {
1171                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1172                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1173                 if (ret != 0)
1174                         return ret;
1175                 if (newstate != state)
1176                         return -ESTALE;
1177         }
1178         if (state->n_wronly != 0) {
1179                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1180                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1181                 if (ret != 0)
1182                         return ret;
1183                 if (newstate != state)
1184                         return -ESTALE;
1185         }
1186         if (state->n_rdonly != 0) {
1187                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1188                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1189                 if (ret != 0)
1190                         return ret;
1191                 if (newstate != state)
1192                         return -ESTALE;
1193         }
1194         /*
1195          * We may have performed cached opens for all three recoveries.
1196          * Check if we need to update the current stateid.
1197          */
1198         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1199             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1200                 write_seqlock(&state->seqlock);
1201                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1202                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1203                 write_sequnlock(&state->seqlock);
1204         }
1205         return 0;
1206 }
1207
1208 /*
1209  * OPEN_RECLAIM:
1210  *      reclaim state on the server after a reboot.
1211  */
1212 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1213 {
1214         struct nfs_delegation *delegation;
1215         struct nfs4_opendata *opendata;
1216         fmode_t delegation_type = 0;
1217         int status;
1218
1219         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1220         if (IS_ERR(opendata))
1221                 return PTR_ERR(opendata);
1222         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1223         opendata->o_arg.fh = NFS_FH(state->inode);
1224         rcu_read_lock();
1225         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1226         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1227                 delegation_type = delegation->type;
1228         rcu_read_unlock();
1229         opendata->o_arg.u.delegation_type = delegation_type;
1230         status = nfs4_open_recover(opendata, state);
1231         nfs4_opendata_put(opendata);
1232         return status;
1233 }
1234
1235 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1236 {
1237         struct nfs_server *server = NFS_SERVER(state->inode);
1238         struct nfs4_exception exception = { };
1239         int err;
1240         do {
1241                 err = _nfs4_do_open_reclaim(ctx, state);
1242                 if (err != -NFS4ERR_DELAY)
1243                         break;
1244                 nfs4_handle_exception(server, err, &exception);
1245         } while (exception.retry);
1246         return err;
1247 }
1248
1249 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1250 {
1251         struct nfs_open_context *ctx;
1252         int ret;
1253
1254         ctx = nfs4_state_find_open_context(state);
1255         if (IS_ERR(ctx))
1256                 return PTR_ERR(ctx);
1257         ret = nfs4_do_open_reclaim(ctx, state);
1258         put_nfs_open_context(ctx);
1259         return ret;
1260 }
1261
1262 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1263 {
1264         struct nfs4_opendata *opendata;
1265         int ret;
1266
1267         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1268         if (IS_ERR(opendata))
1269                 return PTR_ERR(opendata);
1270         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1271         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1272                         sizeof(opendata->o_arg.u.delegation.data));
1273         ret = nfs4_open_recover(opendata, state);
1274         nfs4_opendata_put(opendata);
1275         return ret;
1276 }
1277
1278 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1279 {
1280         struct nfs4_exception exception = { };
1281         struct nfs_server *server = NFS_SERVER(state->inode);
1282         int err;
1283         do {
1284                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1285                 switch (err) {
1286                         case 0:
1287                         case -ENOENT:
1288                         case -ESTALE:
1289                                 goto out;
1290                         case -NFS4ERR_BADSESSION:
1291                         case -NFS4ERR_BADSLOT:
1292                         case -NFS4ERR_BAD_HIGH_SLOT:
1293                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1294                         case -NFS4ERR_DEADSESSION:
1295                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
1296                                 goto out;
1297                         case -NFS4ERR_STALE_CLIENTID:
1298                         case -NFS4ERR_STALE_STATEID:
1299                         case -NFS4ERR_EXPIRED:
1300                                 /* Don't recall a delegation if it was lost */
1301                                 nfs4_schedule_lease_recovery(server->nfs_client);
1302                                 goto out;
1303                         case -ERESTARTSYS:
1304                                 /*
1305                                  * The show must go on: exit, but mark the
1306                                  * stateid as needing recovery.
1307                                  */
1308                         case -NFS4ERR_ADMIN_REVOKED:
1309                         case -NFS4ERR_BAD_STATEID:
1310                                 nfs4_schedule_stateid_recovery(server, state);
1311                         case -EKEYEXPIRED:
1312                                 /*
1313                                  * User RPCSEC_GSS context has expired.
1314                                  * We cannot recover this stateid now, so
1315                                  * skip it and allow recovery thread to
1316                                  * proceed.
1317                                  */
1318                         case -ENOMEM:
1319                                 err = 0;
1320                                 goto out;
1321                 }
1322                 err = nfs4_handle_exception(server, err, &exception);
1323         } while (exception.retry);
1324 out:
1325         return err;
1326 }
1327
1328 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1329 {
1330         struct nfs4_opendata *data = calldata;
1331
1332         data->rpc_status = task->tk_status;
1333         if (data->rpc_status == 0) {
1334                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1335                                 sizeof(data->o_res.stateid.data));
1336                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1337                 renew_lease(data->o_res.server, data->timestamp);
1338                 data->rpc_done = 1;
1339         }
1340 }
1341
1342 static void nfs4_open_confirm_release(void *calldata)
1343 {
1344         struct nfs4_opendata *data = calldata;
1345         struct nfs4_state *state = NULL;
1346
1347         /* If this request hasn't been cancelled, do nothing */
1348         if (data->cancelled == 0)
1349                 goto out_free;
1350         /* In case of error, no cleanup! */
1351         if (!data->rpc_done)
1352                 goto out_free;
1353         state = nfs4_opendata_to_nfs4_state(data);
1354         if (!IS_ERR(state))
1355                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1356 out_free:
1357         nfs4_opendata_put(data);
1358 }
1359
1360 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1361         .rpc_call_done = nfs4_open_confirm_done,
1362         .rpc_release = nfs4_open_confirm_release,
1363 };
1364
1365 /*
1366  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1367  */
1368 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1369 {
1370         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1371         struct rpc_task *task;
1372         struct  rpc_message msg = {
1373                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1374                 .rpc_argp = &data->c_arg,
1375                 .rpc_resp = &data->c_res,
1376                 .rpc_cred = data->owner->so_cred,
1377         };
1378         struct rpc_task_setup task_setup_data = {
1379                 .rpc_client = server->client,
1380                 .rpc_message = &msg,
1381                 .callback_ops = &nfs4_open_confirm_ops,
1382                 .callback_data = data,
1383                 .workqueue = nfsiod_workqueue,
1384                 .flags = RPC_TASK_ASYNC,
1385         };
1386         int status;
1387
1388         kref_get(&data->kref);
1389         data->rpc_done = 0;
1390         data->rpc_status = 0;
1391         data->timestamp = jiffies;
1392         task = rpc_run_task(&task_setup_data);
1393         if (IS_ERR(task))
1394                 return PTR_ERR(task);
1395         status = nfs4_wait_for_completion_rpc_task(task);
1396         if (status != 0) {
1397                 data->cancelled = 1;
1398                 smp_wmb();
1399         } else
1400                 status = data->rpc_status;
1401         rpc_put_task(task);
1402         return status;
1403 }
1404
1405 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1406 {
1407         struct nfs4_opendata *data = calldata;
1408         struct nfs4_state_owner *sp = data->owner;
1409
1410         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1411                 return;
1412         /*
1413          * Check if we still need to send an OPEN call, or if we can use
1414          * a delegation instead.
1415          */
1416         if (data->state != NULL) {
1417                 struct nfs_delegation *delegation;
1418
1419                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1420                         goto out_no_action;
1421                 rcu_read_lock();
1422                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1423                 if (delegation != NULL &&
1424                     test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
1425                         rcu_read_unlock();
1426                         goto out_no_action;
1427                 }
1428                 rcu_read_unlock();
1429         }
1430         /* Update sequence id. */
1431         data->o_arg.id = sp->so_owner_id.id;
1432         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1433         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1434                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1435                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1436         }
1437         data->timestamp = jiffies;
1438         if (nfs4_setup_sequence(data->o_arg.server,
1439                                 &data->o_arg.seq_args,
1440                                 &data->o_res.seq_res, 1, task))
1441                 return;
1442         rpc_call_start(task);
1443         return;
1444 out_no_action:
1445         task->tk_action = NULL;
1446
1447 }
1448
1449 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1450 {
1451         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1452         nfs4_open_prepare(task, calldata);
1453 }
1454
1455 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1456 {
1457         struct nfs4_opendata *data = calldata;
1458
1459         data->rpc_status = task->tk_status;
1460
1461         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1462                 return;
1463
1464         if (task->tk_status == 0) {
1465                 switch (data->o_res.f_attr->mode & S_IFMT) {
1466                         case S_IFREG:
1467                                 break;
1468                         case S_IFLNK:
1469                                 data->rpc_status = -ELOOP;
1470                                 break;
1471                         case S_IFDIR:
1472                                 data->rpc_status = -EISDIR;
1473                                 break;
1474                         default:
1475                                 data->rpc_status = -ENOTDIR;
1476                 }
1477                 renew_lease(data->o_res.server, data->timestamp);
1478                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1479                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1480         }
1481         data->rpc_done = 1;
1482 }
1483
1484 static void nfs4_open_release(void *calldata)
1485 {
1486         struct nfs4_opendata *data = calldata;
1487         struct nfs4_state *state = NULL;
1488
1489         /* If this request hasn't been cancelled, do nothing */
1490         if (data->cancelled == 0)
1491                 goto out_free;
1492         /* In case of error, no cleanup! */
1493         if (data->rpc_status != 0 || !data->rpc_done)
1494                 goto out_free;
1495         /* In case we need an open_confirm, no cleanup! */
1496         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1497                 goto out_free;
1498         state = nfs4_opendata_to_nfs4_state(data);
1499         if (!IS_ERR(state))
1500                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1501 out_free:
1502         nfs4_opendata_put(data);
1503 }
1504
1505 static const struct rpc_call_ops nfs4_open_ops = {
1506         .rpc_call_prepare = nfs4_open_prepare,
1507         .rpc_call_done = nfs4_open_done,
1508         .rpc_release = nfs4_open_release,
1509 };
1510
1511 static const struct rpc_call_ops nfs4_recover_open_ops = {
1512         .rpc_call_prepare = nfs4_recover_open_prepare,
1513         .rpc_call_done = nfs4_open_done,
1514         .rpc_release = nfs4_open_release,
1515 };
1516
1517 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1518 {
1519         struct inode *dir = data->dir->d_inode;
1520         struct nfs_server *server = NFS_SERVER(dir);
1521         struct nfs_openargs *o_arg = &data->o_arg;
1522         struct nfs_openres *o_res = &data->o_res;
1523         struct rpc_task *task;
1524         struct rpc_message msg = {
1525                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1526                 .rpc_argp = o_arg,
1527                 .rpc_resp = o_res,
1528                 .rpc_cred = data->owner->so_cred,
1529         };
1530         struct rpc_task_setup task_setup_data = {
1531                 .rpc_client = server->client,
1532                 .rpc_message = &msg,
1533                 .callback_ops = &nfs4_open_ops,
1534                 .callback_data = data,
1535                 .workqueue = nfsiod_workqueue,
1536                 .flags = RPC_TASK_ASYNC,
1537         };
1538         int status;
1539
1540         kref_get(&data->kref);
1541         data->rpc_done = 0;
1542         data->rpc_status = 0;
1543         data->cancelled = 0;
1544         if (isrecover)
1545                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1546         task = rpc_run_task(&task_setup_data);
1547         if (IS_ERR(task))
1548                 return PTR_ERR(task);
1549         status = nfs4_wait_for_completion_rpc_task(task);
1550         if (status != 0) {
1551                 data->cancelled = 1;
1552                 smp_wmb();
1553         } else
1554                 status = data->rpc_status;
1555         rpc_put_task(task);
1556
1557         return status;
1558 }
1559
1560 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1561 {
1562         struct inode *dir = data->dir->d_inode;
1563         struct nfs_openres *o_res = &data->o_res;
1564         int status;
1565
1566         status = nfs4_run_open_task(data, 1);
1567         if (status != 0 || !data->rpc_done)
1568                 return status;
1569
1570         nfs_refresh_inode(dir, o_res->dir_attr);
1571
1572         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1573                 status = _nfs4_proc_open_confirm(data);
1574                 if (status != 0)
1575                         return status;
1576         }
1577
1578         return status;
1579 }
1580
1581 /*
1582  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1583  */
1584 static int _nfs4_proc_open(struct nfs4_opendata *data)
1585 {
1586         struct inode *dir = data->dir->d_inode;
1587         struct nfs_server *server = NFS_SERVER(dir);
1588         struct nfs_openargs *o_arg = &data->o_arg;
1589         struct nfs_openres *o_res = &data->o_res;
1590         int status;
1591
1592         status = nfs4_run_open_task(data, 0);
1593         if (status != 0 || !data->rpc_done)
1594                 return status;
1595
1596         if (o_arg->open_flags & O_CREAT) {
1597                 update_changeattr(dir, &o_res->cinfo);
1598                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1599         } else
1600                 nfs_refresh_inode(dir, o_res->dir_attr);
1601         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1602                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1603         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1604                 status = _nfs4_proc_open_confirm(data);
1605                 if (status != 0)
1606                         return status;
1607         }
1608         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1609                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1610         return 0;
1611 }
1612
1613 static int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1614 {
1615         unsigned int loop;
1616         int ret;
1617
1618         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1619                 ret = nfs4_wait_clnt_recover(clp);
1620                 if (ret != 0)
1621                         break;
1622                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1623                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1624                         break;
1625                 nfs4_schedule_state_manager(clp);
1626                 ret = -EIO;
1627         }
1628         return ret;
1629 }
1630
1631 static int nfs4_recover_expired_lease(struct nfs_server *server)
1632 {
1633         return nfs4_client_recover_expired_lease(server->nfs_client);
1634 }
1635
1636 /*
1637  * OPEN_EXPIRED:
1638  *      reclaim state on the server after a network partition.
1639  *      Assumes caller holds the appropriate lock
1640  */
1641 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1642 {
1643         struct nfs4_opendata *opendata;
1644         int ret;
1645
1646         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1647         if (IS_ERR(opendata))
1648                 return PTR_ERR(opendata);
1649         ret = nfs4_open_recover(opendata, state);
1650         if (ret == -ESTALE)
1651                 d_drop(ctx->path.dentry);
1652         nfs4_opendata_put(opendata);
1653         return ret;
1654 }
1655
1656 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1657 {
1658         struct nfs_server *server = NFS_SERVER(state->inode);
1659         struct nfs4_exception exception = { };
1660         int err;
1661
1662         do {
1663                 err = _nfs4_open_expired(ctx, state);
1664                 switch (err) {
1665                 default:
1666                         goto out;
1667                 case -NFS4ERR_GRACE:
1668                 case -NFS4ERR_DELAY:
1669                         nfs4_handle_exception(server, err, &exception);
1670                         err = 0;
1671                 }
1672         } while (exception.retry);
1673 out:
1674         return err;
1675 }
1676
1677 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1678 {
1679         struct nfs_open_context *ctx;
1680         int ret;
1681
1682         ctx = nfs4_state_find_open_context(state);
1683         if (IS_ERR(ctx))
1684                 return PTR_ERR(ctx);
1685         ret = nfs4_do_open_expired(ctx, state);
1686         put_nfs_open_context(ctx);
1687         return ret;
1688 }
1689
1690 /*
1691  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1692  * fields corresponding to attributes that were used to store the verifier.
1693  * Make sure we clobber those fields in the later setattr call
1694  */
1695 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1696 {
1697         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1698             !(sattr->ia_valid & ATTR_ATIME_SET))
1699                 sattr->ia_valid |= ATTR_ATIME;
1700
1701         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1702             !(sattr->ia_valid & ATTR_MTIME_SET))
1703                 sattr->ia_valid |= ATTR_MTIME;
1704 }
1705
1706 /*
1707  * Returns a referenced nfs4_state
1708  */
1709 static int _nfs4_do_open(struct inode *dir, struct path *path, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1710 {
1711         struct nfs4_state_owner  *sp;
1712         struct nfs4_state     *state = NULL;
1713         struct nfs_server       *server = NFS_SERVER(dir);
1714         struct nfs4_opendata *opendata;
1715         int status;
1716
1717         /* Protect against reboot recovery conflicts */
1718         status = -ENOMEM;
1719         if (!(sp = nfs4_get_state_owner(server, cred))) {
1720                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1721                 goto out_err;
1722         }
1723         status = nfs4_recover_expired_lease(server);
1724         if (status != 0)
1725                 goto err_put_state_owner;
1726         if (path->dentry->d_inode != NULL)
1727                 nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1728         status = -ENOMEM;
1729         opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr, GFP_KERNEL);
1730         if (opendata == NULL)
1731                 goto err_put_state_owner;
1732
1733         if (path->dentry->d_inode != NULL)
1734                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1735
1736         status = _nfs4_proc_open(opendata);
1737         if (status != 0)
1738                 goto err_opendata_put;
1739
1740         state = nfs4_opendata_to_nfs4_state(opendata);
1741         status = PTR_ERR(state);
1742         if (IS_ERR(state))
1743                 goto err_opendata_put;
1744         if (server->caps & NFS_CAP_POSIX_LOCK)
1745                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1746
1747         if (opendata->o_arg.open_flags & O_EXCL) {
1748                 nfs4_exclusive_attrset(opendata, sattr);
1749
1750                 nfs_fattr_init(opendata->o_res.f_attr);
1751                 status = nfs4_do_setattr(state->inode, cred,
1752                                 opendata->o_res.f_attr, sattr,
1753                                 state);
1754                 if (status == 0)
1755                         nfs_setattr_update_inode(state->inode, sattr);
1756                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1757         }
1758         nfs4_opendata_put(opendata);
1759         nfs4_put_state_owner(sp);
1760         *res = state;
1761         return 0;
1762 err_opendata_put:
1763         nfs4_opendata_put(opendata);
1764 err_put_state_owner:
1765         nfs4_put_state_owner(sp);
1766 out_err:
1767         *res = NULL;
1768         return status;
1769 }
1770
1771
1772 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred)
1773 {
1774         struct nfs4_exception exception = { };
1775         struct nfs4_state *res;
1776         int status;
1777
1778         do {
1779                 status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1780                 if (status == 0)
1781                         break;
1782                 /* NOTE: BAD_SEQID means the server and client disagree about the
1783                  * book-keeping w.r.t. state-changing operations
1784                  * (OPEN/CLOSE/LOCK/LOCKU...)
1785                  * It is actually a sign of a bug on the client or on the server.
1786                  *
1787                  * If we receive a BAD_SEQID error in the particular case of
1788                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1789                  * have unhashed the old state_owner for us, and that we can
1790                  * therefore safely retry using a new one. We should still warn
1791                  * the user though...
1792                  */
1793                 if (status == -NFS4ERR_BAD_SEQID) {
1794                         printk(KERN_WARNING "NFS: v4 server %s "
1795                                         " returned a bad sequence-id error!\n",
1796                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1797                         exception.retry = 1;
1798                         continue;
1799                 }
1800                 /*
1801                  * BAD_STATEID on OPEN means that the server cancelled our
1802                  * state before it received the OPEN_CONFIRM.
1803                  * Recover by retrying the request as per the discussion
1804                  * on Page 181 of RFC3530.
1805                  */
1806                 if (status == -NFS4ERR_BAD_STATEID) {
1807                         exception.retry = 1;
1808                         continue;
1809                 }
1810                 if (status == -EAGAIN) {
1811                         /* We must have found a delegation */
1812                         exception.retry = 1;
1813                         continue;
1814                 }
1815                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1816                                         status, &exception));
1817         } while (exception.retry);
1818         return res;
1819 }
1820
1821 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1822                             struct nfs_fattr *fattr, struct iattr *sattr,
1823                             struct nfs4_state *state)
1824 {
1825         struct nfs_server *server = NFS_SERVER(inode);
1826         struct nfs_setattrargs  arg = {
1827                 .fh             = NFS_FH(inode),
1828                 .iap            = sattr,
1829                 .server         = server,
1830                 .bitmask = server->attr_bitmask,
1831         };
1832         struct nfs_setattrres  res = {
1833                 .fattr          = fattr,
1834                 .server         = server,
1835         };
1836         struct rpc_message msg = {
1837                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1838                 .rpc_argp       = &arg,
1839                 .rpc_resp       = &res,
1840                 .rpc_cred       = cred,
1841         };
1842         unsigned long timestamp = jiffies;
1843         int status;
1844
1845         nfs_fattr_init(fattr);
1846
1847         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1848                 /* Use that stateid */
1849         } else if (state != NULL) {
1850                 nfs4_copy_stateid(&arg.stateid, state, current->files, current->tgid);
1851         } else
1852                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1853
1854         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
1855         if (status == 0 && state != NULL)
1856                 renew_lease(server, timestamp);
1857         return status;
1858 }
1859
1860 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1861                            struct nfs_fattr *fattr, struct iattr *sattr,
1862                            struct nfs4_state *state)
1863 {
1864         struct nfs_server *server = NFS_SERVER(inode);
1865         struct nfs4_exception exception = { };
1866         int err;
1867         do {
1868                 err = nfs4_handle_exception(server,
1869                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1870                                 &exception);
1871         } while (exception.retry);
1872         return err;
1873 }
1874
1875 struct nfs4_closedata {
1876         struct path path;
1877         struct inode *inode;
1878         struct nfs4_state *state;
1879         struct nfs_closeargs arg;
1880         struct nfs_closeres res;
1881         struct nfs_fattr fattr;
1882         unsigned long timestamp;
1883         bool roc;
1884         u32 roc_barrier;
1885 };
1886
1887 static void nfs4_free_closedata(void *data)
1888 {
1889         struct nfs4_closedata *calldata = data;
1890         struct nfs4_state_owner *sp = calldata->state->owner;
1891
1892         if (calldata->roc)
1893                 pnfs_roc_release(calldata->state->inode);
1894         nfs4_put_open_state(calldata->state);
1895         nfs_free_seqid(calldata->arg.seqid);
1896         nfs4_put_state_owner(sp);
1897         path_put(&calldata->path);
1898         kfree(calldata);
1899 }
1900
1901 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
1902                 fmode_t fmode)
1903 {
1904         spin_lock(&state->owner->so_lock);
1905         if (!(fmode & FMODE_READ))
1906                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1907         if (!(fmode & FMODE_WRITE))
1908                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1909         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1910         spin_unlock(&state->owner->so_lock);
1911 }
1912
1913 static void nfs4_close_done(struct rpc_task *task, void *data)
1914 {
1915         struct nfs4_closedata *calldata = data;
1916         struct nfs4_state *state = calldata->state;
1917         struct nfs_server *server = NFS_SERVER(calldata->inode);
1918
1919         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
1920                 return;
1921         /* hmm. we are done with the inode, and in the process of freeing
1922          * the state_owner. we keep this around to process errors
1923          */
1924         switch (task->tk_status) {
1925                 case 0:
1926                         if (calldata->roc)
1927                                 pnfs_roc_set_barrier(state->inode,
1928                                                      calldata->roc_barrier);
1929                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1930                         renew_lease(server, calldata->timestamp);
1931                         nfs4_close_clear_stateid_flags(state,
1932                                         calldata->arg.fmode);
1933                         break;
1934                 case -NFS4ERR_STALE_STATEID:
1935                 case -NFS4ERR_OLD_STATEID:
1936                 case -NFS4ERR_BAD_STATEID:
1937                 case -NFS4ERR_EXPIRED:
1938                         if (calldata->arg.fmode == 0)
1939                                 break;
1940                 default:
1941                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
1942                                 rpc_restart_call_prepare(task);
1943         }
1944         nfs_release_seqid(calldata->arg.seqid);
1945         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1946 }
1947
1948 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1949 {
1950         struct nfs4_closedata *calldata = data;
1951         struct nfs4_state *state = calldata->state;
1952         int call_close = 0;
1953
1954         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1955                 return;
1956
1957         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1958         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
1959         spin_lock(&state->owner->so_lock);
1960         /* Calculate the change in open mode */
1961         if (state->n_rdwr == 0) {
1962                 if (state->n_rdonly == 0) {
1963                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
1964                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1965                         calldata->arg.fmode &= ~FMODE_READ;
1966                 }
1967                 if (state->n_wronly == 0) {
1968                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
1969                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1970                         calldata->arg.fmode &= ~FMODE_WRITE;
1971                 }
1972         }
1973         spin_unlock(&state->owner->so_lock);
1974
1975         if (!call_close) {
1976                 /* Note: exit _without_ calling nfs4_close_done */
1977                 task->tk_action = NULL;
1978                 return;
1979         }
1980
1981         if (calldata->arg.fmode == 0) {
1982                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
1983                 if (calldata->roc &&
1984                     pnfs_roc_drain(calldata->inode, &calldata->roc_barrier)) {
1985                         rpc_sleep_on(&NFS_SERVER(calldata->inode)->roc_rpcwaitq,
1986                                      task, NULL);
1987                         return;
1988                 }
1989         }
1990
1991         nfs_fattr_init(calldata->res.fattr);
1992         calldata->timestamp = jiffies;
1993         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
1994                                 &calldata->arg.seq_args, &calldata->res.seq_res,
1995                                 1, task))
1996                 return;
1997         rpc_call_start(task);
1998 }
1999
2000 static const struct rpc_call_ops nfs4_close_ops = {
2001         .rpc_call_prepare = nfs4_close_prepare,
2002         .rpc_call_done = nfs4_close_done,
2003         .rpc_release = nfs4_free_closedata,
2004 };
2005
2006 /*
2007  * It is possible for data to be read/written from a mem-mapped file
2008  * after the sys_close call (which hits the vfs layer as a flush).
2009  * This means that we can't safely call nfsv4 close on a file until
2010  * the inode is cleared. This in turn means that we are not good
2011  * NFSv4 citizens - we do not indicate to the server to update the file's
2012  * share state even when we are done with one of the three share
2013  * stateid's in the inode.
2014  *
2015  * NOTE: Caller must be holding the sp->so_owner semaphore!
2016  */
2017 int nfs4_do_close(struct path *path, struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc)
2018 {
2019         struct nfs_server *server = NFS_SERVER(state->inode);
2020         struct nfs4_closedata *calldata;
2021         struct nfs4_state_owner *sp = state->owner;
2022         struct rpc_task *task;
2023         struct rpc_message msg = {
2024                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2025                 .rpc_cred = state->owner->so_cred,
2026         };
2027         struct rpc_task_setup task_setup_data = {
2028                 .rpc_client = server->client,
2029                 .rpc_message = &msg,
2030                 .callback_ops = &nfs4_close_ops,
2031                 .workqueue = nfsiod_workqueue,
2032                 .flags = RPC_TASK_ASYNC,
2033         };
2034         int status = -ENOMEM;
2035
2036         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2037         if (calldata == NULL)
2038                 goto out;
2039         calldata->inode = state->inode;
2040         calldata->state = state;
2041         calldata->arg.fh = NFS_FH(state->inode);
2042         calldata->arg.stateid = &state->open_stateid;
2043         /* Serialization for the sequence id */
2044         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2045         if (calldata->arg.seqid == NULL)
2046                 goto out_free_calldata;
2047         calldata->arg.fmode = 0;
2048         calldata->arg.bitmask = server->cache_consistency_bitmask;
2049         calldata->res.fattr = &calldata->fattr;
2050         calldata->res.seqid = calldata->arg.seqid;
2051         calldata->res.server = server;
2052         calldata->roc = roc;
2053         path_get(path);
2054         calldata->path = *path;
2055
2056         msg.rpc_argp = &calldata->arg;
2057         msg.rpc_resp = &calldata->res;
2058         task_setup_data.callback_data = calldata;
2059         task = rpc_run_task(&task_setup_data);
2060         if (IS_ERR(task))
2061                 return PTR_ERR(task);
2062         status = 0;
2063         if (wait)
2064                 status = rpc_wait_for_completion_task(task);
2065         rpc_put_task(task);
2066         return status;
2067 out_free_calldata:
2068         kfree(calldata);
2069 out:
2070         if (roc)
2071                 pnfs_roc_release(state->inode);
2072         nfs4_put_open_state(state);
2073         nfs4_put_state_owner(sp);
2074         return status;
2075 }
2076
2077 static struct inode *
2078 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2079 {
2080         struct nfs4_state *state;
2081
2082         /* Protect against concurrent sillydeletes */
2083         state = nfs4_do_open(dir, &ctx->path, ctx->mode, open_flags, attr, ctx->cred);
2084         if (IS_ERR(state))
2085                 return ERR_CAST(state);
2086         ctx->state = state;
2087         return igrab(state->inode);
2088 }
2089
2090 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2091 {
2092         if (ctx->state == NULL)
2093                 return;
2094         if (is_sync)
2095                 nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
2096         else
2097                 nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
2098 }
2099
2100 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2101 {
2102         struct nfs4_server_caps_arg args = {
2103                 .fhandle = fhandle,
2104         };
2105         struct nfs4_server_caps_res res = {};
2106         struct rpc_message msg = {
2107                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2108                 .rpc_argp = &args,
2109                 .rpc_resp = &res,
2110         };
2111         int status;
2112
2113         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2114         if (status == 0) {
2115                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2116                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2117                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2118                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2119                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2120                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2121                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2122                         server->caps |= NFS_CAP_ACLS;
2123                 if (res.has_links != 0)
2124                         server->caps |= NFS_CAP_HARDLINKS;
2125                 if (res.has_symlinks != 0)
2126                         server->caps |= NFS_CAP_SYMLINKS;
2127                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2128                         server->caps |= NFS_CAP_FILEID;
2129                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2130                         server->caps |= NFS_CAP_MODE;
2131                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2132                         server->caps |= NFS_CAP_NLINK;
2133                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2134                         server->caps |= NFS_CAP_OWNER;
2135                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2136                         server->caps |= NFS_CAP_OWNER_GROUP;
2137                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2138                         server->caps |= NFS_CAP_ATIME;
2139                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2140                         server->caps |= NFS_CAP_CTIME;
2141                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2142                         server->caps |= NFS_CAP_MTIME;
2143
2144                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2145                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2146                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2147                 server->acl_bitmask = res.acl_bitmask;
2148         }
2149
2150         return status;
2151 }
2152
2153 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2154 {
2155         struct nfs4_exception exception = { };
2156         int err;
2157         do {
2158                 err = nfs4_handle_exception(server,
2159                                 _nfs4_server_capabilities(server, fhandle),
2160                                 &exception);
2161         } while (exception.retry);
2162         return err;
2163 }
2164
2165 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2166                 struct nfs_fsinfo *info)
2167 {
2168         struct nfs4_lookup_root_arg args = {
2169                 .bitmask = nfs4_fattr_bitmap,
2170         };
2171         struct nfs4_lookup_res res = {
2172                 .server = server,
2173                 .fattr = info->fattr,
2174                 .fh = fhandle,
2175         };
2176         struct rpc_message msg = {
2177                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2178                 .rpc_argp = &args,
2179                 .rpc_resp = &res,
2180         };
2181
2182         nfs_fattr_init(info->fattr);
2183         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2184 }
2185
2186 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2187                 struct nfs_fsinfo *info)
2188 {
2189         struct nfs4_exception exception = { };
2190         int err;
2191         do {
2192                 err = _nfs4_lookup_root(server, fhandle, info);
2193                 switch (err) {
2194                 case 0:
2195                 case -NFS4ERR_WRONGSEC:
2196                         break;
2197                 default:
2198                         err = nfs4_handle_exception(server, err, &exception);
2199                 }
2200         } while (exception.retry);
2201         return err;
2202 }
2203
2204 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2205                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2206 {
2207         struct rpc_auth *auth;
2208         int ret;
2209
2210         auth = rpcauth_create(flavor, server->client);
2211         if (!auth) {
2212                 ret = -EIO;
2213                 goto out;
2214         }
2215         ret = nfs4_lookup_root(server, fhandle, info);
2216 out:
2217         return ret;
2218 }
2219
2220 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2221                               struct nfs_fsinfo *info)
2222 {
2223         int i, len, status = 0;
2224         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2225
2226         len = gss_mech_list_pseudoflavors(&flav_array[0]);
2227         flav_array[len] = RPC_AUTH_NULL;
2228         len += 1;
2229
2230         for (i = 0; i < len; i++) {
2231                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2232                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2233                         continue;
2234                 break;
2235         }
2236         /*
2237          * -EACCESS could mean that the user doesn't have correct permissions
2238          * to access the mount.  It could also mean that we tried to mount
2239          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2240          * existing mount programs don't handle -EACCES very well so it should
2241          * be mapped to -EPERM instead.
2242          */
2243         if (status == -EACCES)
2244                 status = -EPERM;
2245         return status;
2246 }
2247
2248 /*
2249  * get the file handle for the "/" directory on the server
2250  */
2251 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2252                               struct nfs_fsinfo *info)
2253 {
2254         int minor_version = server->nfs_client->cl_minorversion;
2255         int status = nfs4_lookup_root(server, fhandle, info);
2256         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2257                 /*
2258                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2259                  * by nfs4_map_errors() as this function exits.
2260                  */
2261                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2262         if (status == 0)
2263                 status = nfs4_server_capabilities(server, fhandle);
2264         if (status == 0)
2265                 status = nfs4_do_fsinfo(server, fhandle, info);
2266         return nfs4_map_errors(status);
2267 }
2268
2269 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
2270 /*
2271  * Get locations and (maybe) other attributes of a referral.
2272  * Note that we'll actually follow the referral later when
2273  * we detect fsid mismatch in inode revalidation
2274  */
2275 static int nfs4_get_referral(struct inode *dir, const struct qstr *name,
2276                              struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2277 {
2278         int status = -ENOMEM;
2279         struct page *page = NULL;
2280         struct nfs4_fs_locations *locations = NULL;
2281
2282         page = alloc_page(GFP_KERNEL);
2283         if (page == NULL)
2284                 goto out;
2285         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2286         if (locations == NULL)
2287                 goto out;
2288
2289         status = nfs4_proc_fs_locations(dir, name, locations, page);
2290         if (status != 0)
2291                 goto out;
2292         /* Make sure server returned a different fsid for the referral */
2293         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2294                 dprintk("%s: server did not return a different fsid for"
2295                         " a referral at %s\n", __func__, name->name);
2296                 status = -EIO;
2297                 goto out;
2298         }
2299         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2300         nfs_fixup_referral_attributes(&locations->fattr);
2301
2302         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2303         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2304         memset(fhandle, 0, sizeof(struct nfs_fh));
2305 out:
2306         if (page)
2307                 __free_page(page);
2308         kfree(locations);
2309         return status;
2310 }
2311
2312 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2313 {
2314         struct nfs4_getattr_arg args = {
2315                 .fh = fhandle,
2316                 .bitmask = server->attr_bitmask,
2317         };
2318         struct nfs4_getattr_res res = {
2319                 .fattr = fattr,
2320                 .server = server,
2321         };
2322         struct rpc_message msg = {
2323                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2324                 .rpc_argp = &args,
2325                 .rpc_resp = &res,
2326         };
2327
2328         nfs_fattr_init(fattr);
2329         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2330 }
2331
2332 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2333 {
2334         struct nfs4_exception exception = { };
2335         int err;
2336         do {
2337                 err = nfs4_handle_exception(server,
2338                                 _nfs4_proc_getattr(server, fhandle, fattr),
2339                                 &exception);
2340         } while (exception.retry);
2341         return err;
2342 }
2343
2344 /*
2345  * The file is not closed if it is opened due to the a request to change
2346  * the size of the file. The open call will not be needed once the
2347  * VFS layer lookup-intents are implemented.
2348  *
2349  * Close is called when the inode is destroyed.
2350  * If we haven't opened the file for O_WRONLY, we
2351  * need to in the size_change case to obtain a stateid.
2352  *
2353  * Got race?
2354  * Because OPEN is always done by name in nfsv4, it is
2355  * possible that we opened a different file by the same
2356  * name.  We can recognize this race condition, but we
2357  * can't do anything about it besides returning an error.
2358  *
2359  * This will be fixed with VFS changes (lookup-intent).
2360  */
2361 static int
2362 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2363                   struct iattr *sattr)
2364 {
2365         struct inode *inode = dentry->d_inode;
2366         struct rpc_cred *cred = NULL;
2367         struct nfs4_state *state = NULL;
2368         int status;
2369
2370         if (pnfs_ld_layoutret_on_setattr(inode))
2371                 pnfs_return_layout(inode);
2372
2373         nfs_fattr_init(fattr);
2374
2375         /* Search for an existing open(O_WRITE) file */
2376         if (sattr->ia_valid & ATTR_FILE) {
2377                 struct nfs_open_context *ctx;
2378
2379                 ctx = nfs_file_open_context(sattr->ia_file);
2380                 if (ctx) {
2381                         cred = ctx->cred;
2382                         state = ctx->state;
2383                 }
2384         }
2385
2386         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2387         if (status == 0)
2388                 nfs_setattr_update_inode(inode, sattr);
2389         return status;
2390 }
2391
2392 static int _nfs4_proc_lookupfh(struct rpc_clnt *clnt, struct nfs_server *server,
2393                 const struct nfs_fh *dirfh, const struct qstr *name,
2394                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2395 {
2396         int                    status;
2397         struct nfs4_lookup_arg args = {
2398                 .bitmask = server->attr_bitmask,
2399                 .dir_fh = dirfh,
2400                 .name = name,
2401         };
2402         struct nfs4_lookup_res res = {
2403                 .server = server,
2404                 .fattr = fattr,
2405                 .fh = fhandle,
2406         };
2407         struct rpc_message msg = {
2408                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2409                 .rpc_argp = &args,
2410                 .rpc_resp = &res,
2411         };
2412
2413         nfs_fattr_init(fattr);
2414
2415         dprintk("NFS call  lookupfh %s\n", name->name);
2416         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2417         dprintk("NFS reply lookupfh: %d\n", status);
2418         return status;
2419 }
2420
2421 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
2422                               struct qstr *name, struct nfs_fh *fhandle,
2423                               struct nfs_fattr *fattr)
2424 {
2425         struct nfs4_exception exception = { };
2426         int err;
2427         do {
2428                 err = _nfs4_proc_lookupfh(server->client, server, dirfh, name, fhandle, fattr);
2429                 /* FIXME: !!!! */
2430                 if (err == -NFS4ERR_MOVED) {
2431                         err = -EREMOTE;
2432                         break;
2433                 }
2434                 err = nfs4_handle_exception(server, err, &exception);
2435         } while (exception.retry);
2436         return err;
2437 }
2438
2439 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2440                 const struct qstr *name, struct nfs_fh *fhandle,
2441                 struct nfs_fattr *fattr)
2442 {
2443         int status;
2444
2445         dprintk("NFS call  lookup %s\n", name->name);
2446         status = _nfs4_proc_lookupfh(clnt, NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
2447         if (status == -NFS4ERR_MOVED)
2448                 status = nfs4_get_referral(dir, name, fattr, fhandle);
2449         dprintk("NFS reply lookup: %d\n", status);
2450         return status;
2451 }
2452
2453 void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr, struct nfs_fh *fh)
2454 {
2455         memset(fh, 0, sizeof(struct nfs_fh));
2456         fattr->fsid.major = 1;
2457         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2458                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_FSID | NFS_ATTR_FATTR_MOUNTPOINT;
2459         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2460         fattr->nlink = 2;
2461 }
2462
2463 static int nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, struct qstr *name,
2464                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2465 {
2466         struct nfs4_exception exception = { };
2467         int err;
2468         do {
2469                 err = nfs4_handle_exception(NFS_SERVER(dir),
2470                                 _nfs4_proc_lookup(clnt, dir, name, fhandle, fattr),
2471                                 &exception);
2472                 if (err == -EPERM)
2473                         nfs_fixup_secinfo_attributes(fattr, fhandle);
2474         } while (exception.retry);
2475         return err;
2476 }
2477
2478 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2479 {
2480         struct nfs_server *server = NFS_SERVER(inode);
2481         struct nfs4_accessargs args = {
2482                 .fh = NFS_FH(inode),
2483                 .bitmask = server->attr_bitmask,
2484         };
2485         struct nfs4_accessres res = {
2486                 .server = server,
2487         };
2488         struct rpc_message msg = {
2489                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2490                 .rpc_argp = &args,
2491                 .rpc_resp = &res,
2492                 .rpc_cred = entry->cred,
2493         };
2494         int mode = entry->mask;
2495         int status;
2496
2497         /*
2498          * Determine which access bits we want to ask for...
2499          */
2500         if (mode & MAY_READ)
2501                 args.access |= NFS4_ACCESS_READ;
2502         if (S_ISDIR(inode->i_mode)) {
2503                 if (mode & MAY_WRITE)
2504                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2505                 if (mode & MAY_EXEC)
2506                         args.access |= NFS4_ACCESS_LOOKUP;
2507         } else {
2508                 if (mode & MAY_WRITE)
2509                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2510                 if (mode & MAY_EXEC)
2511                         args.access |= NFS4_ACCESS_EXECUTE;
2512         }
2513
2514         res.fattr = nfs_alloc_fattr();
2515         if (res.fattr == NULL)
2516                 return -ENOMEM;
2517
2518         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2519         if (!status) {
2520                 entry->mask = 0;
2521                 if (res.access & NFS4_ACCESS_READ)
2522                         entry->mask |= MAY_READ;
2523                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2524                         entry->mask |= MAY_WRITE;
2525                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2526                         entry->mask |= MAY_EXEC;
2527                 nfs_refresh_inode(inode, res.fattr);
2528         }
2529         nfs_free_fattr(res.fattr);
2530         return status;
2531 }
2532
2533 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2534 {
2535         struct nfs4_exception exception = { };
2536         int err;
2537         do {
2538                 err = nfs4_handle_exception(NFS_SERVER(inode),
2539                                 _nfs4_proc_access(inode, entry),
2540                                 &exception);
2541         } while (exception.retry);
2542         return err;
2543 }
2544
2545 /*
2546  * TODO: For the time being, we don't try to get any attributes
2547  * along with any of the zero-copy operations READ, READDIR,
2548  * READLINK, WRITE.
2549  *
2550  * In the case of the first three, we want to put the GETATTR
2551  * after the read-type operation -- this is because it is hard
2552  * to predict the length of a GETATTR response in v4, and thus
2553  * align the READ data correctly.  This means that the GETATTR
2554  * may end up partially falling into the page cache, and we should
2555  * shift it into the 'tail' of the xdr_buf before processing.
2556  * To do this efficiently, we need to know the total length
2557  * of data received, which doesn't seem to be available outside
2558  * of the RPC layer.
2559  *
2560  * In the case of WRITE, we also want to put the GETATTR after
2561  * the operation -- in this case because we want to make sure
2562  * we get the post-operation mtime and size.  This means that
2563  * we can't use xdr_encode_pages() as written: we need a variant
2564  * of it which would leave room in the 'tail' iovec.
2565  *
2566  * Both of these changes to the XDR layer would in fact be quite
2567  * minor, but I decided to leave them for a subsequent patch.
2568  */
2569 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2570                 unsigned int pgbase, unsigned int pglen)
2571 {
2572         struct nfs4_readlink args = {
2573                 .fh       = NFS_FH(inode),
2574                 .pgbase   = pgbase,
2575                 .pglen    = pglen,
2576                 .pages    = &page,
2577         };
2578         struct nfs4_readlink_res res;
2579         struct rpc_message msg = {
2580                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2581                 .rpc_argp = &args,
2582                 .rpc_resp = &res,
2583         };
2584
2585         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2586 }
2587
2588 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2589                 unsigned int pgbase, unsigned int pglen)
2590 {
2591         struct nfs4_exception exception = { };
2592         int err;
2593         do {
2594                 err = nfs4_handle_exception(NFS_SERVER(inode),
2595                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2596                                 &exception);
2597         } while (exception.retry);
2598         return err;
2599 }
2600
2601 /*
2602  * Got race?
2603  * We will need to arrange for the VFS layer to provide an atomic open.
2604  * Until then, this create/open method is prone to inefficiency and race
2605  * conditions due to the lookup, create, and open VFS calls from sys_open()
2606  * placed on the wire.
2607  *
2608  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2609  * The file will be opened again in the subsequent VFS open call
2610  * (nfs4_proc_file_open).
2611  *
2612  * The open for read will just hang around to be used by any process that
2613  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2614  */
2615
2616 static int
2617 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2618                  int flags, struct nfs_open_context *ctx)
2619 {
2620         struct path my_path = {
2621                 .dentry = dentry,
2622         };
2623         struct path *path = &my_path;
2624         struct nfs4_state *state;
2625         struct rpc_cred *cred = NULL;
2626         fmode_t fmode = 0;
2627         int status = 0;
2628
2629         if (ctx != NULL) {
2630                 cred = ctx->cred;
2631                 path = &ctx->path;
2632                 fmode = ctx->mode;
2633         }
2634         sattr->ia_mode &= ~current_umask();
2635         state = nfs4_do_open(dir, path, fmode, flags, sattr, cred);
2636         d_drop(dentry);
2637         if (IS_ERR(state)) {
2638                 status = PTR_ERR(state);
2639                 goto out;
2640         }
2641         d_add(dentry, igrab(state->inode));
2642         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2643         if (ctx != NULL)
2644                 ctx->state = state;
2645         else
2646                 nfs4_close_sync(path, state, fmode);
2647 out:
2648         return status;
2649 }
2650
2651 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2652 {
2653         struct nfs_server *server = NFS_SERVER(dir);
2654         struct nfs_removeargs args = {
2655                 .fh = NFS_FH(dir),
2656                 .name.len = name->len,
2657                 .name.name = name->name,
2658                 .bitmask = server->attr_bitmask,
2659         };
2660         struct nfs_removeres res = {
2661                 .server = server,
2662         };
2663         struct rpc_message msg = {
2664                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2665                 .rpc_argp = &args,
2666                 .rpc_resp = &res,
2667         };
2668         int status = -ENOMEM;
2669
2670         res.dir_attr = nfs_alloc_fattr();
2671         if (res.dir_attr == NULL)
2672                 goto out;
2673
2674         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2675         if (status == 0) {
2676                 update_changeattr(dir, &res.cinfo);
2677                 nfs_post_op_update_inode(dir, res.dir_attr);
2678         }
2679         nfs_free_fattr(res.dir_attr);
2680 out:
2681         return status;
2682 }
2683
2684 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2685 {
2686         struct nfs4_exception exception = { };
2687         int err;
2688         do {
2689                 err = nfs4_handle_exception(NFS_SERVER(dir),
2690                                 _nfs4_proc_remove(dir, name),
2691                                 &exception);
2692         } while (exception.retry);
2693         return err;
2694 }
2695
2696 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2697 {
2698         struct nfs_server *server = NFS_SERVER(dir);
2699         struct nfs_removeargs *args = msg->rpc_argp;
2700         struct nfs_removeres *res = msg->rpc_resp;
2701
2702         args->bitmask = server->cache_consistency_bitmask;
2703         res->server = server;
2704         res->seq_res.sr_slot = NULL;
2705         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2706 }
2707
2708 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2709 {
2710         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2711
2712         if (!nfs4_sequence_done(task, &res->seq_res))
2713                 return 0;
2714         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2715                 return 0;
2716         update_changeattr(dir, &res->cinfo);
2717         nfs_post_op_update_inode(dir, res->dir_attr);
2718         return 1;
2719 }
2720
2721 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2722 {
2723         struct nfs_server *server = NFS_SERVER(dir);
2724         struct nfs_renameargs *arg = msg->rpc_argp;
2725         struct nfs_renameres *res = msg->rpc_resp;
2726
2727         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2728         arg->bitmask = server->attr_bitmask;
2729         res->server = server;
2730 }
2731
2732 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2733                                  struct inode *new_dir)
2734 {
2735         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2736
2737         if (!nfs4_sequence_done(task, &res->seq_res))
2738                 return 0;
2739         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2740                 return 0;
2741
2742         update_changeattr(old_dir, &res->old_cinfo);
2743         nfs_post_op_update_inode(old_dir, res->old_fattr);
2744         update_changeattr(new_dir, &res->new_cinfo);
2745         nfs_post_op_update_inode(new_dir, res->new_fattr);
2746         return 1;
2747 }
2748
2749 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2750                 struct inode *new_dir, struct qstr *new_name)
2751 {
2752         struct nfs_server *server = NFS_SERVER(old_dir);
2753         struct nfs_renameargs arg = {
2754                 .old_dir = NFS_FH(old_dir),
2755                 .new_dir = NFS_FH(new_dir),
2756                 .old_name = old_name,
2757                 .new_name = new_name,
2758                 .bitmask = server->attr_bitmask,
2759         };
2760         struct nfs_renameres res = {
2761                 .server = server,
2762         };
2763         struct rpc_message msg = {
2764                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2765                 .rpc_argp = &arg,
2766                 .rpc_resp = &res,
2767         };
2768         int status = -ENOMEM;
2769
2770         res.old_fattr = nfs_alloc_fattr();
2771         res.new_fattr = nfs_alloc_fattr();
2772         if (res.old_fattr == NULL || res.new_fattr == NULL)
2773                 goto out;
2774
2775         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2776         if (!status) {
2777                 update_changeattr(old_dir, &res.old_cinfo);
2778                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2779                 update_changeattr(new_dir, &res.new_cinfo);
2780                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2781         }
2782 out:
2783         nfs_free_fattr(res.new_fattr);
2784         nfs_free_fattr(res.old_fattr);
2785         return status;
2786 }
2787
2788 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2789                 struct inode *new_dir, struct qstr *new_name)
2790 {
2791         struct nfs4_exception exception = { };
2792         int err;
2793         do {
2794                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2795                                 _nfs4_proc_rename(old_dir, old_name,
2796                                         new_dir, new_name),
2797                                 &exception);
2798         } while (exception.retry);
2799         return err;
2800 }
2801
2802 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2803 {
2804         struct nfs_server *server = NFS_SERVER(inode);
2805         struct nfs4_link_arg arg = {
2806                 .fh     = NFS_FH(inode),
2807                 .dir_fh = NFS_FH(dir),
2808                 .name   = name,
2809                 .bitmask = server->attr_bitmask,
2810         };
2811         struct nfs4_link_res res = {
2812                 .server = server,
2813         };
2814         struct rpc_message msg = {
2815                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2816                 .rpc_argp = &arg,
2817                 .rpc_resp = &res,
2818         };
2819         int status = -ENOMEM;
2820
2821         res.fattr = nfs_alloc_fattr();
2822         res.dir_attr = nfs_alloc_fattr();
2823         if (res.fattr == NULL || res.dir_attr == NULL)
2824                 goto out;
2825
2826         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2827         if (!status) {
2828                 update_changeattr(dir, &res.cinfo);
2829                 nfs_post_op_update_inode(dir, res.dir_attr);
2830                 nfs_post_op_update_inode(inode, res.fattr);
2831         }
2832 out:
2833         nfs_free_fattr(res.dir_attr);
2834         nfs_free_fattr(res.fattr);
2835         return status;
2836 }
2837
2838 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2839 {
2840         struct nfs4_exception exception = { };
2841         int err;
2842         do {
2843                 err = nfs4_handle_exception(NFS_SERVER(inode),
2844                                 _nfs4_proc_link(inode, dir, name),
2845                                 &exception);
2846         } while (exception.retry);
2847         return err;
2848 }
2849
2850 struct nfs4_createdata {
2851         struct rpc_message msg;
2852         struct nfs4_create_arg arg;
2853         struct nfs4_create_res res;
2854         struct nfs_fh fh;
2855         struct nfs_fattr fattr;
2856         struct nfs_fattr dir_fattr;
2857 };
2858
2859 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2860                 struct qstr *name, struct iattr *sattr, u32 ftype)
2861 {
2862         struct nfs4_createdata *data;
2863
2864         data = kzalloc(sizeof(*data), GFP_KERNEL);
2865         if (data != NULL) {
2866                 struct nfs_server *server = NFS_SERVER(dir);
2867
2868                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2869                 data->msg.rpc_argp = &data->arg;
2870                 data->msg.rpc_resp = &data->res;
2871                 data->arg.dir_fh = NFS_FH(dir);
2872                 data->arg.server = server;
2873                 data->arg.name = name;
2874                 data->arg.attrs = sattr;
2875                 data->arg.ftype = ftype;
2876                 data->arg.bitmask = server->attr_bitmask;
2877                 data->res.server = server;
2878                 data->res.fh = &data->fh;
2879                 data->res.fattr = &data->fattr;
2880                 data->res.dir_fattr = &data->dir_fattr;
2881                 nfs_fattr_init(data->res.fattr);
2882                 nfs_fattr_init(data->res.dir_fattr);
2883         }
2884         return data;
2885 }
2886
2887 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2888 {
2889         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
2890                                     &data->arg.seq_args, &data->res.seq_res, 1);
2891         if (status == 0) {
2892                 update_changeattr(dir, &data->res.dir_cinfo);
2893                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2894                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2895         }
2896         return status;
2897 }
2898
2899 static void nfs4_free_createdata(struct nfs4_createdata *data)
2900 {
2901         kfree(data);
2902 }
2903
2904 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2905                 struct page *page, unsigned int len, struct iattr *sattr)
2906 {
2907         struct nfs4_createdata *data;
2908         int status = -ENAMETOOLONG;
2909
2910         if (len > NFS4_MAXPATHLEN)
2911                 goto out;
2912
2913         status = -ENOMEM;
2914         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2915         if (data == NULL)
2916                 goto out;
2917
2918         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2919         data->arg.u.symlink.pages = &page;
2920         data->arg.u.symlink.len = len;
2921
2922         status = nfs4_do_create(dir, dentry, data);
2923
2924         nfs4_free_createdata(data);
2925 out:
2926         return status;
2927 }
2928
2929 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2930                 struct page *page, unsigned int len, struct iattr *sattr)
2931 {
2932         struct nfs4_exception exception = { };
2933         int err;
2934         do {
2935                 err = nfs4_handle_exception(NFS_SERVER(dir),
2936                                 _nfs4_proc_symlink(dir, dentry, page,
2937                                                         len, sattr),
2938                                 &exception);
2939         } while (exception.retry);
2940         return err;
2941 }
2942
2943 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2944                 struct iattr *sattr)
2945 {
2946         struct nfs4_createdata *data;
2947         int status = -ENOMEM;
2948
2949         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2950         if (data == NULL)
2951                 goto out;
2952
2953         status = nfs4_do_create(dir, dentry, data);
2954
2955         nfs4_free_createdata(data);
2956 out:
2957         return status;
2958 }
2959
2960 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2961                 struct iattr *sattr)
2962 {
2963         struct nfs4_exception exception = { };
2964         int err;
2965
2966         sattr->ia_mode &= ~current_umask();
2967         do {
2968                 err = nfs4_handle_exception(NFS_SERVER(dir),
2969                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2970                                 &exception);
2971         } while (exception.retry);
2972         return err;
2973 }
2974
2975 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2976                 u64 cookie, struct page **pages, unsigned int count, int plus)
2977 {
2978         struct inode            *dir = dentry->d_inode;
2979         struct nfs4_readdir_arg args = {
2980                 .fh = NFS_FH(dir),
2981                 .pages = pages,
2982                 .pgbase = 0,
2983                 .count = count,
2984                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2985                 .plus = plus,
2986         };
2987         struct nfs4_readdir_res res;
2988         struct rpc_message msg = {
2989                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2990                 .rpc_argp = &args,
2991                 .rpc_resp = &res,
2992                 .rpc_cred = cred,
2993         };
2994         int                     status;
2995
2996         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2997                         dentry->d_parent->d_name.name,
2998                         dentry->d_name.name,
2999                         (unsigned long long)cookie);
3000         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
3001         res.pgbase = args.pgbase;
3002         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3003         if (status >= 0) {
3004                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
3005                 status += args.pgbase;
3006         }
3007
3008         nfs_invalidate_atime(dir);
3009
3010         dprintk("%s: returns %d\n", __func__, status);
3011         return status;
3012 }
3013
3014 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3015                 u64 cookie, struct page **pages, unsigned int count, int plus)
3016 {
3017         struct nfs4_exception exception = { };
3018         int err;
3019         do {
3020                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3021                                 _nfs4_proc_readdir(dentry, cred, cookie,
3022                                         pages, count, plus),
3023                                 &exception);
3024         } while (exception.retry);
3025         return err;
3026 }
3027
3028 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3029                 struct iattr *sattr, dev_t rdev)
3030 {
3031         struct nfs4_createdata *data;
3032         int mode = sattr->ia_mode;
3033         int status = -ENOMEM;
3034
3035         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
3036         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
3037
3038         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3039         if (data == NULL)
3040                 goto out;
3041
3042         if (S_ISFIFO(mode))
3043                 data->arg.ftype = NF4FIFO;
3044         else if (S_ISBLK(mode)) {
3045                 data->arg.ftype = NF4BLK;
3046                 data->arg.u.device.specdata1 = MAJOR(rdev);
3047                 data->arg.u.device.specdata2 = MINOR(rdev);
3048         }
3049         else if (S_ISCHR(mode)) {
3050                 data->arg.ftype = NF4CHR;
3051                 data->arg.u.device.specdata1 = MAJOR(rdev);
3052                 data->arg.u.device.specdata2 = MINOR(rdev);
3053         }
3054
3055         status = nfs4_do_create(dir, dentry, data);
3056
3057         nfs4_free_createdata(data);
3058 out:
3059         return status;
3060 }
3061
3062 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3063                 struct iattr *sattr, dev_t rdev)
3064 {
3065         struct nfs4_exception exception = { };
3066         int err;
3067
3068         sattr->ia_mode &= ~current_umask();
3069         do {
3070                 err = nfs4_handle_exception(NFS_SERVER(dir),
3071                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3072                                 &exception);
3073         } while (exception.retry);
3074         return err;
3075 }
3076
3077 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3078                  struct nfs_fsstat *fsstat)
3079 {
3080         struct nfs4_statfs_arg args = {
3081                 .fh = fhandle,
3082                 .bitmask = server->attr_bitmask,
3083         };
3084         struct nfs4_statfs_res res = {
3085                 .fsstat = fsstat,
3086         };
3087         struct rpc_message msg = {
3088                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3089                 .rpc_argp = &args,
3090                 .rpc_resp = &res,
3091         };
3092
3093         nfs_fattr_init(fsstat->fattr);
3094         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3095 }
3096
3097 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3098 {
3099         struct nfs4_exception exception = { };
3100         int err;
3101         do {
3102                 err = nfs4_handle_exception(server,
3103                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3104                                 &exception);
3105         } while (exception.retry);
3106         return err;
3107 }
3108
3109 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3110                 struct nfs_fsinfo *fsinfo)
3111 {
3112         struct nfs4_fsinfo_arg args = {
3113                 .fh = fhandle,
3114                 .bitmask = server->attr_bitmask,
3115         };
3116         struct nfs4_fsinfo_res res = {
3117                 .fsinfo = fsinfo,
3118         };
3119         struct rpc_message msg = {
3120                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3121                 .rpc_argp = &args,
3122                 .rpc_resp = &res,
3123         };
3124
3125         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3126 }
3127
3128 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3129 {
3130         struct nfs4_exception exception = { };
3131         int err;
3132
3133         do {
3134                 err = nfs4_handle_exception(server,
3135                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3136                                 &exception);
3137         } while (exception.retry);
3138         return err;
3139 }
3140
3141 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3142 {
3143         nfs_fattr_init(fsinfo->fattr);
3144         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3145 }
3146
3147 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3148                 struct nfs_pathconf *pathconf)
3149 {
3150         struct nfs4_pathconf_arg args = {
3151                 .fh = fhandle,
3152                 .bitmask = server->attr_bitmask,
3153         };
3154         struct nfs4_pathconf_res res = {
3155                 .pathconf = pathconf,
3156         };
3157         struct rpc_message msg = {
3158                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3159                 .rpc_argp = &args,
3160                 .rpc_resp = &res,
3161         };
3162
3163         /* None of the pathconf attributes are mandatory to implement */
3164         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3165                 memset(pathconf, 0, sizeof(*pathconf));
3166                 return 0;
3167         }
3168
3169         nfs_fattr_init(pathconf->fattr);
3170         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3171 }
3172
3173 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3174                 struct nfs_pathconf *pathconf)
3175 {
3176         struct nfs4_exception exception = { };
3177         int err;
3178
3179         do {
3180                 err = nfs4_handle_exception(server,
3181                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3182                                 &exception);
3183         } while (exception.retry);
3184         return err;
3185 }
3186
3187 void __nfs4_read_done_cb(struct nfs_read_data *data)
3188 {
3189         nfs_invalidate_atime(data->inode);
3190 }
3191
3192 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3193 {
3194         struct nfs_server *server = NFS_SERVER(data->inode);
3195
3196         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3197                 nfs_restart_rpc(task, server->nfs_client);
3198                 return -EAGAIN;
3199         }
3200
3201         __nfs4_read_done_cb(data);
3202         if (task->tk_status > 0)
3203                 renew_lease(server, data->timestamp);
3204         return 0;
3205 }
3206
3207 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3208 {
3209
3210         dprintk("--> %s\n", __func__);
3211
3212         if (!nfs4_sequence_done(task, &data->res.seq_res))
3213                 return -EAGAIN;
3214
3215         return data->read_done_cb ? data->read_done_cb(task, data) :
3216                                     nfs4_read_done_cb(task, data);
3217 }
3218
3219 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3220 {
3221         data->timestamp   = jiffies;
3222         data->read_done_cb = nfs4_read_done_cb;
3223         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3224 }
3225
3226 /* Reset the the nfs_read_data to send the read to the MDS. */
3227 void nfs4_reset_read(struct rpc_task *task, struct nfs_read_data *data)
3228 {
3229         dprintk("%s Reset task for i/o through\n", __func__);
3230         put_lseg(data->lseg);
3231         data->lseg = NULL;
3232         /* offsets will differ in the dense stripe case */
3233         data->args.offset = data->mds_offset;
3234         data->ds_clp = NULL;
3235         data->args.fh     = NFS_FH(data->inode);
3236         data->read_done_cb = nfs4_read_done_cb;
3237         task->tk_ops = data->mds_ops;
3238         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3239 }
3240 EXPORT_SYMBOL_GPL(nfs4_reset_read);
3241
3242 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3243 {
3244         struct inode *inode = data->inode;
3245
3246         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3247                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3248                 return -EAGAIN;
3249         }
3250         if (task->tk_status >= 0) {
3251                 renew_lease(NFS_SERVER(inode), data->timestamp);
3252                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3253         }
3254         return 0;
3255 }
3256
3257 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3258 {
3259         if (!nfs4_sequence_done(task, &data->res.seq_res))
3260                 return -EAGAIN;
3261         return data->write_done_cb ? data->write_done_cb(task, data) :
3262                 nfs4_write_done_cb(task, data);
3263 }
3264
3265 /* Reset the the nfs_write_data to send the write to the MDS. */
3266 void nfs4_reset_write(struct rpc_task *task, struct nfs_write_data *data)
3267 {
3268         dprintk("%s Reset task for i/o through\n", __func__);
3269         put_lseg(data->lseg);
3270         data->lseg          = NULL;
3271         data->ds_clp        = NULL;
3272         data->write_done_cb = nfs4_write_done_cb;
3273         data->args.fh       = NFS_FH(data->inode);
3274         data->args.bitmask  = data->res.server->cache_consistency_bitmask;
3275         data->args.offset   = data->mds_offset;
3276         data->res.fattr     = &data->fattr;
3277         task->tk_ops        = data->mds_ops;
3278         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3279 }
3280 EXPORT_SYMBOL_GPL(nfs4_reset_write);
3281
3282 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3283 {
3284         struct nfs_server *server = NFS_SERVER(data->inode);
3285
3286         if (data->lseg) {
3287                 data->args.bitmask = NULL;
3288                 data->res.fattr = NULL;
3289         } else
3290                 data->args.bitmask = server->cache_consistency_bitmask;
3291         if (!data->write_done_cb)
3292                 data->write_done_cb = nfs4_write_done_cb;
3293         data->res.server = server;
3294         data->timestamp   = jiffies;
3295
3296         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3297 }
3298
3299 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3300 {
3301         struct inode *inode = data->inode;
3302
3303         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3304                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3305                 return -EAGAIN;
3306         }
3307         nfs_refresh_inode(inode, data->res.fattr);
3308         return 0;
3309 }
3310
3311 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3312 {
3313         if (!nfs4_sequence_done(task, &data->res.seq_res))
3314                 return -EAGAIN;
3315         return data->write_done_cb(task, data);
3316 }
3317
3318 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3319 {
3320         struct nfs_server *server = NFS_SERVER(data->inode);
3321
3322         if (data->lseg) {
3323                 data->args.bitmask = NULL;
3324                 data->res.fattr = NULL;
3325         } else
3326                 data->args.bitmask = server->cache_consistency_bitmask;
3327         if (!data->write_done_cb)
3328                 data->write_done_cb = nfs4_commit_done_cb;
3329         data->res.server = server;
3330         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3331 }
3332
3333 struct nfs4_renewdata {
3334         struct nfs_client       *client;
3335         unsigned long           timestamp;
3336 };
3337
3338 /*
3339  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3340  * standalone procedure for queueing an asynchronous RENEW.
3341  */
3342 static void nfs4_renew_release(void *calldata)
3343 {
3344         struct nfs4_renewdata *data = calldata;
3345         struct nfs_client *clp = data->client;
3346
3347         if (atomic_read(&clp->cl_count) > 1)
3348                 nfs4_schedule_state_renewal(clp);
3349         nfs_put_client(clp);
3350         kfree(data);
3351 }
3352
3353 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3354 {
3355         struct nfs4_renewdata *data = calldata;
3356         struct nfs_client *clp = data->client;
3357         unsigned long timestamp = data->timestamp;
3358
3359         if (task->tk_status < 0) {
3360                 /* Unless we're shutting down, schedule state recovery! */
3361                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
3362                         nfs4_schedule_lease_recovery(clp);
3363                 return;
3364         }
3365         do_renew_lease(clp, timestamp);
3366 }
3367
3368 static const struct rpc_call_ops nfs4_renew_ops = {
3369         .rpc_call_done = nfs4_renew_done,
3370         .rpc_release = nfs4_renew_release,
3371 };
3372
3373 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
3374 {
3375         struct rpc_message msg = {
3376                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3377                 .rpc_argp       = clp,
3378                 .rpc_cred       = cred,
3379         };
3380         struct nfs4_renewdata *data;
3381
3382         if (!atomic_inc_not_zero(&clp->cl_count))
3383                 return -EIO;
3384         data = kmalloc(sizeof(*data), GFP_KERNEL);
3385         if (data == NULL)
3386                 return -ENOMEM;
3387         data->client = clp;
3388         data->timestamp = jiffies;
3389         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3390                         &nfs4_renew_ops, data);
3391 }
3392
3393 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3394 {
3395         struct rpc_message msg = {
3396                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3397                 .rpc_argp       = clp,
3398                 .rpc_cred       = cred,
3399         };
3400         unsigned long now = jiffies;
3401         int status;
3402
3403         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3404         if (status < 0)
3405                 return status;
3406         do_renew_lease(clp, now);
3407         return 0;
3408 }
3409
3410 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3411 {
3412         return (server->caps & NFS_CAP_ACLS)
3413                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3414                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3415 }
3416
3417 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3418  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3419  * the stack.
3420  */
3421 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3422
3423 static void buf_to_pages(const void *buf, size_t buflen,
3424                 struct page **pages, unsigned int *pgbase)
3425 {
3426         const void *p = buf;
3427
3428         *pgbase = offset_in_page(buf);
3429         p -= *pgbase;
3430         while (p < buf + buflen) {
3431                 *(pages++) = virt_to_page(p);
3432                 p += PAGE_CACHE_SIZE;
3433         }
3434 }
3435
3436 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3437                 struct page **pages, unsigned int *pgbase)
3438 {
3439         struct page *newpage, **spages;
3440         int rc = 0;
3441         size_t len;
3442         spages = pages;
3443
3444         do {
3445                 len = min_t(size_t, PAGE_CACHE_SIZE, buflen);
3446                 newpage = alloc_page(GFP_KERNEL);
3447
3448                 if (newpage == NULL)
3449                         goto unwind;
3450                 memcpy(page_address(newpage), buf, len);
3451                 buf += len;
3452                 buflen -= len;
3453                 *pages++ = newpage;
3454                 rc++;
3455         } while (buflen != 0);
3456
3457         return rc;
3458
3459 unwind:
3460         for(; rc > 0; rc--)
3461                 __free_page(spages[rc-1]);
3462         return -ENOMEM;
3463 }
3464
3465 struct nfs4_cached_acl {
3466         int cached;
3467         size_t len;
3468         char data[0];
3469 };
3470
3471 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3472 {
3473         struct nfs_inode *nfsi = NFS_I(inode);
3474
3475         spin_lock(&inode->i_lock);
3476         kfree(nfsi->nfs4_acl);
3477         nfsi->nfs4_acl = acl;
3478         spin_unlock(&inode->i_lock);
3479 }
3480
3481 static void nfs4_zap_acl_attr(struct inode *inode)
3482 {
3483         nfs4_set_cached_acl(inode, NULL);
3484 }
3485
3486 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3487 {
3488         struct nfs_inode *nfsi = NFS_I(inode);
3489         struct nfs4_cached_acl *acl;
3490         int ret = -ENOENT;
3491
3492         spin_lock(&inode->i_lock);
3493         acl = nfsi->nfs4_acl;
3494         if (acl == NULL)
3495                 goto out;
3496         if (buf == NULL) /* user is just asking for length */
3497                 goto out_len;
3498         if (acl->cached == 0)
3499                 goto out;
3500         ret = -ERANGE; /* see getxattr(2) man page */
3501         if (acl->len > buflen)
3502                 goto out;
3503         memcpy(buf, acl->data, acl->len);
3504 out_len:
3505         ret = acl->len;
3506 out:
3507         spin_unlock(&inode->i_lock);
3508         return ret;
3509 }
3510
3511 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3512 {
3513         struct nfs4_cached_acl *acl;
3514
3515         if (buf && acl_len <= PAGE_SIZE) {
3516                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3517                 if (acl == NULL)
3518                         goto out;
3519                 acl->cached = 1;
3520                 memcpy(acl->data, buf, acl_len);
3521         } else {
3522                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3523                 if (acl == NULL)
3524                         goto out;
3525                 acl->cached = 0;
3526         }
3527         acl->len = acl_len;
3528 out:
3529         nfs4_set_cached_acl(inode, acl);
3530 }
3531
3532 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3533 {
3534         struct page *pages[NFS4ACL_MAXPAGES];
3535         struct nfs_getaclargs args = {
3536                 .fh = NFS_FH(inode),
3537                 .acl_pages = pages,
3538                 .acl_len = buflen,
3539         };
3540         struct nfs_getaclres res = {
3541                 .acl_len = buflen,
3542         };
3543         void *resp_buf;
3544         struct rpc_message msg = {
3545                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3546                 .rpc_argp = &args,
3547                 .rpc_resp = &res,
3548         };
3549         struct page *localpage = NULL;
3550         int ret;
3551
3552         if (buflen < PAGE_SIZE) {
3553                 /* As long as we're doing a round trip to the server anyway,
3554                  * let's be prepared for a page of acl data. */
3555                 localpage = alloc_page(GFP_KERNEL);
3556                 resp_buf = page_address(localpage);
3557                 if (localpage == NULL)
3558                         return -ENOMEM;
3559                 args.acl_pages[0] = localpage;
3560                 args.acl_pgbase = 0;
3561                 args.acl_len = PAGE_SIZE;
3562         } else {
3563                 resp_buf = buf;
3564                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3565         }
3566         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3567         if (ret)
3568                 goto out_free;
3569         if (res.acl_len > args.acl_len)
3570                 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3571         else
3572                 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3573         if (buf) {
3574                 ret = -ERANGE;
3575                 if (res.acl_len > buflen)
3576                         goto out_free;
3577                 if (localpage)
3578                         memcpy(buf, resp_buf, res.acl_len);
3579         }
3580         ret = res.acl_len;
3581 out_free:
3582         if (localpage)
3583                 __free_page(localpage);
3584         return ret;
3585 }
3586
3587 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3588 {
3589         struct nfs4_exception exception = { };
3590         ssize_t ret;
3591         do {
3592                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3593                 if (ret >= 0)
3594                         break;
3595                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3596         } while (exception.retry);
3597         return ret;
3598 }
3599
3600 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3601 {
3602         struct nfs_server *server = NFS_SERVER(inode);
3603         int ret;
3604
3605         if (!nfs4_server_supports_acls(server))
3606                 return -EOPNOTSUPP;
3607         ret = nfs_revalidate_inode(server, inode);
3608         if (ret < 0)
3609                 return ret;
3610         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3611                 nfs_zap_acl_cache(inode);
3612         ret = nfs4_read_cached_acl(inode, buf, buflen);
3613         if (ret != -ENOENT)
3614                 return ret;
3615         return nfs4_get_acl_uncached(inode, buf, buflen);
3616 }
3617
3618 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3619 {
3620         struct nfs_server *server = NFS_SERVER(inode);
3621         struct page *pages[NFS4ACL_MAXPAGES];
3622         struct nfs_setaclargs arg = {
3623                 .fh             = NFS_FH(inode),
3624                 .acl_pages      = pages,
3625                 .acl_len        = buflen,
3626         };
3627         struct nfs_setaclres res;
3628         struct rpc_message msg = {
3629                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3630                 .rpc_argp       = &arg,
3631                 .rpc_resp       = &res,
3632         };
3633         int ret, i;
3634
3635         if (!nfs4_server_supports_acls(server))
3636                 return -EOPNOTSUPP;
3637         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3638         if (i < 0)
3639                 return i;
3640         nfs_inode_return_delegation(inode);
3641         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3642
3643         /*
3644          * Free each page after tx, so the only ref left is
3645          * held by the network stack
3646          */
3647         for (; i > 0; i--)
3648                 put_page(pages[i-1]);
3649
3650         /*
3651          * Acl update can result in inode attribute update.
3652          * so mark the attribute cache invalid.
3653          */
3654         spin_lock(&inode->i_lock);
3655         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3656         spin_unlock(&inode->i_lock);
3657         nfs_access_zap_cache(inode);
3658         nfs_zap_acl_cache(inode);
3659         return ret;
3660 }
3661
3662 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3663 {
3664         struct nfs4_exception exception = { };
3665         int err;
3666         do {
3667                 err = nfs4_handle_exception(NFS_SERVER(inode),
3668                                 __nfs4_proc_set_acl(inode, buf, buflen),
3669                                 &exception);
3670         } while (exception.retry);
3671         return err;
3672 }
3673
3674 static int
3675 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3676 {
3677         struct nfs_client *clp = server->nfs_client;
3678
3679         if (task->tk_status >= 0)
3680                 return 0;
3681         switch(task->tk_status) {
3682                 case -NFS4ERR_ADMIN_REVOKED:
3683                 case -NFS4ERR_BAD_STATEID:
3684                 case -NFS4ERR_OPENMODE:
3685                         if (state == NULL)
3686                                 break;
3687                         nfs4_schedule_stateid_recovery(server, state);
3688                         goto wait_on_recovery;
3689                 case -NFS4ERR_EXPIRED:
3690                         if (state != NULL)
3691                                 nfs4_schedule_stateid_recovery(server, state);
3692                 case -NFS4ERR_STALE_STATEID:
3693                 case -NFS4ERR_STALE_CLIENTID:
3694                         nfs4_schedule_lease_recovery(clp);
3695                         goto wait_on_recovery;
3696 #if defined(CONFIG_NFS_V4_1)
3697                 case -NFS4ERR_BADSESSION:
3698                 case -NFS4ERR_BADSLOT:
3699                 case -NFS4ERR_BAD_HIGH_SLOT:
3700                 case -NFS4ERR_DEADSESSION:
3701                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3702                 case -NFS4ERR_SEQ_FALSE_RETRY:
3703                 case -NFS4ERR_SEQ_MISORDERED:
3704                         dprintk("%s ERROR %d, Reset session\n", __func__,
3705                                 task->tk_status);
3706                         nfs4_schedule_session_recovery(clp->cl_session);
3707                         task->tk_status = 0;
3708                         return -EAGAIN;
3709 #endif /* CONFIG_NFS_V4_1 */
3710                 case -NFS4ERR_DELAY:
3711                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3712                 case -NFS4ERR_GRACE:
3713                 case -EKEYEXPIRED:
3714                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3715                         task->tk_status = 0;
3716                         return -EAGAIN;
3717                 case -NFS4ERR_RETRY_UNCACHED_REP:
3718                 case -NFS4ERR_OLD_STATEID:
3719                         task->tk_status = 0;
3720                         return -EAGAIN;
3721         }
3722         task->tk_status = nfs4_map_errors(task->tk_status);
3723         return 0;
3724 wait_on_recovery:
3725         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3726         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3727                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3728         task->tk_status = 0;
3729         return -EAGAIN;
3730 }
3731
3732 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3733                 unsigned short port, struct rpc_cred *cred,
3734                 struct nfs4_setclientid_res *res)
3735 {
3736         nfs4_verifier sc_verifier;
3737         struct nfs4_setclientid setclientid = {
3738                 .sc_verifier = &sc_verifier,
3739                 .sc_prog = program,
3740                 .sc_cb_ident = clp->cl_cb_ident,
3741         };
3742         struct rpc_message msg = {
3743                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3744                 .rpc_argp = &setclientid,
3745                 .rpc_resp = res,
3746                 .rpc_cred = cred,
3747         };
3748         __be32 *p;
3749         int loop = 0;
3750         int status;
3751
3752         p = (__be32*)sc_verifier.data;
3753         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3754         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3755
3756         for(;;) {
3757                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3758                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3759                                 clp->cl_ipaddr,
3760                                 rpc_peeraddr2str(clp->cl_rpcclient,
3761                                                         RPC_DISPLAY_ADDR),
3762                                 rpc_peeraddr2str(clp->cl_rpcclient,
3763                                                         RPC_DISPLAY_PROTO),
3764                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3765                                 clp->cl_id_uniquifier);
3766                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3767                                 sizeof(setclientid.sc_netid),
3768                                 rpc_peeraddr2str(clp->cl_rpcclient,
3769                                                         RPC_DISPLAY_NETID));
3770                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3771                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3772                                 clp->cl_ipaddr, port >> 8, port & 255);
3773
3774                 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3775                 if (status != -NFS4ERR_CLID_INUSE)
3776                         break;
3777                 if (loop != 0) {
3778                         ++clp->cl_id_uniquifier;
3779                         break;
3780                 }
3781                 ++loop;
3782                 ssleep(clp->cl_lease_time / HZ + 1);
3783         }
3784         return status;
3785 }
3786
3787 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3788                 struct nfs4_setclientid_res *arg,
3789                 struct rpc_cred *cred)
3790 {
3791         struct nfs_fsinfo fsinfo;
3792         struct rpc_message msg = {
3793                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3794                 .rpc_argp = arg,
3795                 .rpc_resp = &fsinfo,
3796                 .rpc_cred = cred,
3797         };
3798         unsigned long now;
3799         int status;
3800
3801         now = jiffies;
3802         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3803         if (status == 0) {
3804                 spin_lock(&clp->cl_lock);
3805                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3806                 clp->cl_last_renewal = now;
3807                 spin_unlock(&clp->cl_lock);
3808         }
3809         return status;
3810 }
3811
3812 struct nfs4_delegreturndata {
3813         struct nfs4_delegreturnargs args;
3814         struct nfs4_delegreturnres res;
3815         struct nfs_fh fh;
3816         nfs4_stateid stateid;
3817         unsigned long timestamp;
3818         struct nfs_fattr fattr;
3819         int rpc_status;
3820 };
3821
3822 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3823 {
3824         struct nfs4_delegreturndata *data = calldata;
3825
3826         if (!nfs4_sequence_done(task, &data->res.seq_res))
3827                 return;
3828
3829         switch (task->tk_status) {
3830         case -NFS4ERR_STALE_STATEID:
3831         case -NFS4ERR_EXPIRED:
3832         case 0:
3833                 renew_lease(data->res.server, data->timestamp);
3834                 break;
3835         default:
3836                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
3837                                 -EAGAIN) {
3838                         nfs_restart_rpc(task, data->res.server->nfs_client);
3839                         return;
3840                 }
3841         }
3842         data->rpc_status = task->tk_status;
3843 }
3844
3845 static void nfs4_delegreturn_release(void *calldata)
3846 {
3847         kfree(calldata);
3848 }
3849
3850 #if defined(CONFIG_NFS_V4_1)
3851 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3852 {
3853         struct nfs4_delegreturndata *d_data;
3854
3855         d_data = (struct nfs4_delegreturndata *)data;
3856
3857         if (nfs4_setup_sequence(d_data->res.server,
3858                                 &d_data->args.seq_args,
3859                                 &d_data->res.seq_res, 1, task))
3860                 return;
3861         rpc_call_start(task);
3862 }
3863 #endif /* CONFIG_NFS_V4_1 */
3864
3865 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3866 #if defined(CONFIG_NFS_V4_1)
3867         .rpc_call_prepare = nfs4_delegreturn_prepare,
3868 #endif /* CONFIG_NFS_V4_1 */
3869         .rpc_call_done = nfs4_delegreturn_done,
3870         .rpc_release = nfs4_delegreturn_release,
3871 };
3872
3873 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3874 {
3875         struct nfs4_delegreturndata *data;
3876         struct nfs_server *server = NFS_SERVER(inode);
3877         struct rpc_task *task;
3878         struct rpc_message msg = {
3879                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3880                 .rpc_cred = cred,
3881         };
3882         struct rpc_task_setup task_setup_data = {
3883                 .rpc_client = server->client,
3884                 .rpc_message = &msg,
3885                 .callback_ops = &nfs4_delegreturn_ops,
3886                 .flags = RPC_TASK_ASYNC,
3887         };
3888         int status = 0;
3889
3890         data = kzalloc(sizeof(*data), GFP_NOFS);
3891         if (data == NULL)
3892                 return -ENOMEM;
3893         data->args.fhandle = &data->fh;
3894         data->args.stateid = &data->stateid;
3895         data->args.bitmask = server->attr_bitmask;
3896         nfs_copy_fh(&data->fh, NFS_FH(inode));
3897         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3898         data->res.fattr = &data->fattr;
3899         data->res.server = server;
3900         nfs_fattr_init(data->res.fattr);
3901         data->timestamp = jiffies;
3902         data->rpc_status = 0;
3903
3904         task_setup_data.callback_data = data;
3905         msg.rpc_argp = &data->args;
3906         msg.rpc_resp = &data->res;
3907         task = rpc_run_task(&task_setup_data);
3908         if (IS_ERR(task))
3909                 return PTR_ERR(task);
3910         if (!issync)
3911                 goto out;
3912         status = nfs4_wait_for_completion_rpc_task(task);
3913         if (status != 0)
3914                 goto out;
3915         status = data->rpc_status;
3916         if (status != 0)
3917                 goto out;
3918         nfs_refresh_inode(inode, &data->fattr);
3919 out:
3920         rpc_put_task(task);
3921         return status;
3922 }
3923
3924 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3925 {
3926         struct nfs_server *server = NFS_SERVER(inode);
3927         struct nfs4_exception exception = { };
3928         int err;
3929         do {
3930                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3931                 switch (err) {
3932                         case -NFS4ERR_STALE_STATEID:
3933                         case -NFS4ERR_EXPIRED:
3934                         case 0:
3935                                 return 0;
3936                 }
3937                 err = nfs4_handle_exception(server, err, &exception);
3938         } while (exception.retry);
3939         return err;
3940 }
3941
3942 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3943 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3944
3945 /*
3946  * sleep, with exponential backoff, and retry the LOCK operation.
3947  */
3948 static unsigned long
3949 nfs4_set_lock_task_retry(unsigned long timeout)
3950 {
3951         schedule_timeout_killable(timeout);
3952         timeout <<= 1;
3953         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3954                 return NFS4_LOCK_MAXTIMEOUT;
3955         return timeout;
3956 }
3957
3958 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3959 {
3960         struct inode *inode = state->inode;
3961         struct nfs_server *server = NFS_SERVER(inode);
3962         struct nfs_client *clp = server->nfs_client;
3963         struct nfs_lockt_args arg = {
3964                 .fh = NFS_FH(inode),
3965                 .fl = request,
3966         };
3967         struct nfs_lockt_res res = {
3968                 .denied = request,
3969         };
3970         struct rpc_message msg = {
3971                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3972                 .rpc_argp       = &arg,
3973                 .rpc_resp       = &res,
3974                 .rpc_cred       = state->owner->so_cred,
3975         };
3976         struct nfs4_lock_state *lsp;
3977         int status;
3978
3979         arg.lock_owner.clientid = clp->cl_clientid;
3980         status = nfs4_set_lock_state(state, request);
3981         if (status != 0)
3982                 goto out;
3983         lsp = request->fl_u.nfs4_fl.owner;
3984         arg.lock_owner.id = lsp->ls_id.id;
3985         arg.lock_owner.s_dev = server->s_dev;
3986         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3987         switch (status) {
3988                 case 0:
3989                         request->fl_type = F_UNLCK;
3990                         break;
3991                 case -NFS4ERR_DENIED:
3992                         status = 0;
3993         }
3994         request->fl_ops->fl_release_private(request);
3995 out:
3996         return status;
3997 }
3998
3999 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4000 {
4001         struct nfs4_exception exception = { };
4002         int err;
4003
4004         do {
4005                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4006                                 _nfs4_proc_getlk(state, cmd, request),
4007                                 &exception);
4008         } while (exception.retry);
4009         return err;
4010 }
4011
4012 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4013 {
4014         int res = 0;
4015         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4016                 case FL_POSIX:
4017                         res = posix_lock_file_wait(file, fl);
4018                         break;
4019                 case FL_FLOCK:
4020                         res = flock_lock_file_wait(file, fl);
4021                         break;
4022                 default:
4023                         BUG();
4024         }
4025         return res;
4026 }
4027
4028 struct nfs4_unlockdata {
4029         struct nfs_locku_args arg;
4030         struct nfs_locku_res res;
4031         struct nfs4_lock_state *lsp;
4032         struct nfs_open_context *ctx;
4033         struct file_lock fl;
4034         const struct nfs_server *server;
4035         unsigned long timestamp;
4036 };
4037
4038 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4039                 struct nfs_open_context *ctx,
4040                 struct nfs4_lock_state *lsp,
4041                 struct nfs_seqid *seqid)
4042 {
4043         struct nfs4_unlockdata *p;
4044         struct inode *inode = lsp->ls_state->inode;
4045
4046         p = kzalloc(sizeof(*p), GFP_NOFS);
4047         if (p == NULL)
4048                 return NULL;
4049         p->arg.fh = NFS_FH(inode);
4050         p->arg.fl = &p->fl;
4051         p->arg.seqid = seqid;
4052         p->res.seqid = seqid;
4053         p->arg.stateid = &lsp->ls_stateid;
4054         p->lsp = lsp;
4055         atomic_inc(&lsp->ls_count);
4056         /* Ensure we don't close file until we're done freeing locks! */
4057         p->ctx = get_nfs_open_context(ctx);
4058         memcpy(&p->fl, fl, sizeof(p->fl));
4059         p->server = NFS_SERVER(inode);
4060         return p;
4061 }
4062
4063 static void nfs4_locku_release_calldata(void *data)
4064 {
4065         struct nfs4_unlockdata *calldata = data;
4066         nfs_free_seqid(calldata->arg.seqid);
4067         nfs4_put_lock_state(calldata->lsp);
4068         put_nfs_open_context(calldata->ctx);
4069         kfree(calldata);
4070 }
4071
4072 static void nfs4_locku_done(struct rpc_task *task, void *data)
4073 {
4074         struct nfs4_unlockdata *calldata = data;
4075
4076         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4077                 return;
4078         switch (task->tk_status) {
4079                 case 0:
4080                         memcpy(calldata->lsp->ls_stateid.data,
4081                                         calldata->res.stateid.data,
4082                                         sizeof(calldata->lsp->ls_stateid.data));
4083                         renew_lease(calldata->server, calldata->timestamp);
4084                         break;
4085                 case -NFS4ERR_BAD_STATEID:
4086                 case -NFS4ERR_OLD_STATEID:
4087                 case -NFS4ERR_STALE_STATEID:
4088                 case -NFS4ERR_EXPIRED:
4089                         break;
4090                 default:
4091                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4092                                 nfs_restart_rpc(task,
4093                                                  calldata->server->nfs_client);
4094         }
4095 }
4096
4097 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4098 {
4099         struct nfs4_unlockdata *calldata = data;
4100
4101         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4102                 return;
4103         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
4104                 /* Note: exit _without_ running nfs4_locku_done */
4105                 task->tk_action = NULL;
4106                 return;
4107         }
4108         calldata->timestamp = jiffies;
4109         if (nfs4_setup_sequence(calldata->server,
4110                                 &calldata->arg.seq_args,
4111                                 &calldata->res.seq_res, 1, task))
4112                 return;
4113         rpc_call_start(task);
4114 }
4115
4116 static const struct rpc_call_ops nfs4_locku_ops = {
4117         .rpc_call_prepare = nfs4_locku_prepare,
4118         .rpc_call_done = nfs4_locku_done,
4119         .rpc_release = nfs4_locku_release_calldata,
4120 };
4121
4122 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4123                 struct nfs_open_context *ctx,
4124                 struct nfs4_lock_state *lsp,
4125                 struct nfs_seqid *seqid)
4126 {
4127         struct nfs4_unlockdata *data;
4128         struct rpc_message msg = {
4129                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4130                 .rpc_cred = ctx->cred,
4131         };
4132         struct rpc_task_setup task_setup_data = {
4133                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4134                 .rpc_message = &msg,
4135                 .callback_ops = &nfs4_locku_ops,
4136                 .workqueue = nfsiod_workqueue,
4137                 .flags = RPC_TASK_ASYNC,
4138         };
4139
4140         /* Ensure this is an unlock - when canceling a lock, the
4141          * canceled lock is passed in, and it won't be an unlock.
4142          */
4143         fl->fl_type = F_UNLCK;
4144
4145         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4146         if (data == NULL) {
4147                 nfs_free_seqid(seqid);
4148                 return ERR_PTR(-ENOMEM);
4149         }
4150
4151         msg.rpc_argp = &data->arg;
4152         msg.rpc_resp = &data->res;
4153         task_setup_data.callback_data = data;
4154         return rpc_run_task(&task_setup_data);
4155 }
4156
4157 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4158 {
4159         struct nfs_inode *nfsi = NFS_I(state->inode);
4160         struct nfs_seqid *seqid;
4161         struct nfs4_lock_state *lsp;
4162         struct rpc_task *task;
4163         int status = 0;
4164         unsigned char fl_flags = request->fl_flags;
4165
4166         status = nfs4_set_lock_state(state, request);
4167         /* Unlock _before_ we do the RPC call */
4168         request->fl_flags |= FL_EXISTS;
4169         down_read(&nfsi->rwsem);
4170         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4171                 up_read(&nfsi->rwsem);
4172                 goto out;
4173         }
4174         up_read(&nfsi->rwsem);
4175         if (status != 0)
4176                 goto out;
4177         /* Is this a delegated lock? */
4178         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4179                 goto out;
4180         lsp = request->fl_u.nfs4_fl.owner;
4181         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4182         status = -ENOMEM;
4183         if (seqid == NULL)
4184                 goto out;
4185         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4186         status = PTR_ERR(task);
4187         if (IS_ERR(task))
4188                 goto out;
4189         status = nfs4_wait_for_completion_rpc_task(task);
4190         rpc_put_task(task);
4191 out:
4192         request->fl_flags = fl_flags;
4193         return status;
4194 }
4195
4196 struct nfs4_lockdata {
4197         struct nfs_lock_args arg;
4198         struct nfs_lock_res res;
4199         struct nfs4_lock_state *lsp;
4200         struct nfs_open_context *ctx;
4201         struct file_lock fl;
4202         unsigned long timestamp;
4203         int rpc_status;
4204         int cancelled;
4205         struct nfs_server *server;
4206 };
4207
4208 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4209                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4210                 gfp_t gfp_mask)
4211 {
4212         struct nfs4_lockdata *p;
4213         struct inode *inode = lsp->ls_state->inode;
4214         struct nfs_server *server = NFS_SERVER(inode);
4215
4216         p = kzalloc(sizeof(*p), gfp_mask);
4217         if (p == NULL)
4218                 return NULL;
4219
4220         p->arg.fh = NFS_FH(inode);
4221         p->arg.fl = &p->fl;
4222         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4223         if (p->arg.open_seqid == NULL)
4224                 goto out_free;
4225         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4226         if (p->arg.lock_seqid == NULL)
4227                 goto out_free_seqid;
4228         p->arg.lock_stateid = &lsp->ls_stateid;
4229         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4230         p->arg.lock_owner.id = lsp->ls_id.id;
4231         p->arg.lock_owner.s_dev = server->s_dev;
4232         p->res.lock_seqid = p->arg.lock_seqid;
4233         p->lsp = lsp;
4234         p->server = server;
4235         atomic_inc(&lsp->ls_count);
4236         p->ctx = get_nfs_open_context(ctx);
4237         memcpy(&p->fl, fl, sizeof(p->fl));
4238         return p;
4239 out_free_seqid:
4240         nfs_free_seqid(p->arg.open_seqid);
4241 out_free:
4242         kfree(p);
4243         return NULL;
4244 }
4245
4246 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4247 {
4248         struct nfs4_lockdata *data = calldata;
4249         struct nfs4_state *state = data->lsp->ls_state;
4250
4251         dprintk("%s: begin!\n", __func__);
4252         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4253                 return;
4254         /* Do we need to do an open_to_lock_owner? */
4255         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4256                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4257                         return;
4258                 data->arg.open_stateid = &state->stateid;
4259                 data->arg.new_lock_owner = 1;
4260                 data->res.open_seqid = data->arg.open_seqid;
4261         } else
4262                 data->arg.new_lock_owner = 0;
4263         data->timestamp = jiffies;
4264         if (nfs4_setup_sequence(data->server,
4265                                 &data->arg.seq_args,
4266                                 &data->res.seq_res, 1, task))
4267                 return;
4268         rpc_call_start(task);
4269         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4270 }
4271
4272 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4273 {
4274         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4275         nfs4_lock_prepare(task, calldata);
4276 }
4277
4278 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4279 {
4280         struct nfs4_lockdata *data = calldata;
4281
4282         dprintk("%s: begin!\n", __func__);
4283
4284         if (!nfs4_sequence_done(task, &data->res.seq_res))
4285                 return;
4286
4287         data->rpc_status = task->tk_status;
4288         if (data->arg.new_lock_owner != 0) {
4289                 if (data->rpc_status == 0)
4290                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4291                 else
4292                         goto out;
4293         }
4294         if (data->rpc_status == 0) {
4295                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
4296                                         sizeof(data->lsp->ls_stateid.data));
4297                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4298                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
4299         }
4300 out:
4301         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4302 }
4303
4304 static void nfs4_lock_release(void *calldata)
4305 {
4306         struct nfs4_lockdata *data = calldata;
4307
4308         dprintk("%s: begin!\n", __func__);
4309         nfs_free_seqid(data->arg.open_seqid);
4310         if (data->cancelled != 0) {
4311                 struct rpc_task *task;
4312                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4313                                 data->arg.lock_seqid);
4314                 if (!IS_ERR(task))
4315                         rpc_put_task_async(task);
4316                 dprintk("%s: cancelling lock!\n", __func__);
4317         } else
4318                 nfs_free_seqid(data->arg.lock_seqid);
4319         nfs4_put_lock_state(data->lsp);
4320         put_nfs_open_context(data->ctx);
4321         kfree(data);
4322         dprintk("%s: done!\n", __func__);
4323 }
4324
4325 static const struct rpc_call_ops nfs4_lock_ops = {
4326         .rpc_call_prepare = nfs4_lock_prepare,
4327         .rpc_call_done = nfs4_lock_done,
4328         .rpc_release = nfs4_lock_release,
4329 };
4330
4331 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4332         .rpc_call_prepare = nfs4_recover_lock_prepare,
4333         .rpc_call_done = nfs4_lock_done,
4334         .rpc_release = nfs4_lock_release,
4335 };
4336
4337 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4338 {
4339         switch (error) {
4340         case -NFS4ERR_ADMIN_REVOKED:
4341         case -NFS4ERR_BAD_STATEID:
4342                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4343                 if (new_lock_owner != 0 ||
4344                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4345                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4346                 break;
4347         case -NFS4ERR_STALE_STATEID:
4348                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4349         case -NFS4ERR_EXPIRED:
4350                 nfs4_schedule_lease_recovery(server->nfs_client);
4351         };
4352 }
4353
4354 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4355 {
4356         struct nfs4_lockdata *data;
4357         struct rpc_task *task;
4358         struct rpc_message msg = {
4359                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4360                 .rpc_cred = state->owner->so_cred,
4361         };
4362         struct rpc_task_setup task_setup_data = {
4363                 .rpc_client = NFS_CLIENT(state->inode),
4364                 .rpc_message = &msg,
4365                 .callback_ops = &nfs4_lock_ops,
4366                 .workqueue = nfsiod_workqueue,
4367                 .flags = RPC_TASK_ASYNC,
4368         };
4369         int ret;
4370
4371         dprintk("%s: begin!\n", __func__);
4372         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4373                         fl->fl_u.nfs4_fl.owner,
4374                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4375         if (data == NULL)
4376                 return -ENOMEM;
4377         if (IS_SETLKW(cmd))
4378                 data->arg.block = 1;
4379         if (recovery_type > NFS_LOCK_NEW) {
4380                 if (recovery_type == NFS_LOCK_RECLAIM)
4381                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4382                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4383         }
4384         msg.rpc_argp = &data->arg;
4385         msg.rpc_resp = &data->res;
4386         task_setup_data.callback_data = data;
4387         task = rpc_run_task(&task_setup_data);
4388         if (IS_ERR(task))
4389                 return PTR_ERR(task);
4390         ret = nfs4_wait_for_completion_rpc_task(task);
4391         if (ret == 0) {
4392                 ret = data->rpc_status;
4393                 if (ret)
4394                         nfs4_handle_setlk_error(data->server, data->lsp,
4395                                         data->arg.new_lock_owner, ret);
4396         } else
4397                 data->cancelled = 1;
4398         rpc_put_task(task);
4399         dprintk("%s: done, ret = %d!\n", __func__, ret);
4400         return ret;
4401 }
4402
4403 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4404 {
4405         struct nfs_server *server = NFS_SERVER(state->inode);
4406         struct nfs4_exception exception = { };
4407         int err;
4408
4409         do {
4410                 /* Cache the lock if possible... */
4411                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4412                         return 0;
4413                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4414                 if (err != -NFS4ERR_DELAY)
4415                         break;
4416                 nfs4_handle_exception(server, err, &exception);
4417         } while (exception.retry);
4418         return err;
4419 }
4420
4421 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4422 {
4423         struct nfs_server *server = NFS_SERVER(state->inode);
4424         struct nfs4_exception exception = { };
4425         int err;
4426
4427         err = nfs4_set_lock_state(state, request);
4428         if (err != 0)
4429                 return err;
4430         do {
4431                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4432                         return 0;
4433                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4434                 switch (err) {
4435                 default:
4436                         goto out;
4437                 case -NFS4ERR_GRACE:
4438                 case -NFS4ERR_DELAY:
4439                         nfs4_handle_exception(server, err, &exception);
4440                         err = 0;
4441                 }
4442         } while (exception.retry);
4443 out:
4444         return err;
4445 }
4446
4447 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4448 {
4449         struct nfs_inode *nfsi = NFS_I(state->inode);
4450         unsigned char fl_flags = request->fl_flags;
4451         int status = -ENOLCK;
4452
4453         if ((fl_flags & FL_POSIX) &&
4454                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4455                 goto out;
4456         /* Is this a delegated open? */
4457         status = nfs4_set_lock_state(state, request);
4458         if (status != 0)
4459                 goto out;
4460         request->fl_flags |= FL_ACCESS;
4461         status = do_vfs_lock(request->fl_file, request);
4462         if (status < 0)
4463                 goto out;
4464         down_read(&nfsi->rwsem);
4465         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4466                 /* Yes: cache locks! */
4467                 /* ...but avoid races with delegation recall... */
4468                 request->fl_flags = fl_flags & ~FL_SLEEP;
4469                 status = do_vfs_lock(request->fl_file, request);
4470                 goto out_unlock;
4471         }
4472         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4473         if (status != 0)
4474                 goto out_unlock;
4475         /* Note: we always want to sleep here! */
4476         request->fl_flags = fl_flags | FL_SLEEP;
4477         if (do_vfs_lock(request->fl_file, request) < 0)
4478                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4479 out_unlock:
4480         up_read(&nfsi->rwsem);
4481 out:
4482         request->fl_flags = fl_flags;
4483         return status;
4484 }
4485
4486 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4487 {
4488         struct nfs4_exception exception = { };
4489         int err;
4490
4491         do {
4492                 err = _nfs4_proc_setlk(state, cmd, request);
4493                 if (err == -NFS4ERR_DENIED)
4494                         err = -EAGAIN;
4495                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4496                                 err, &exception);
4497         } while (exception.retry);
4498         return err;
4499 }
4500
4501 static int
4502 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4503 {
4504         struct nfs_open_context *ctx;
4505         struct nfs4_state *state;
4506         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4507         int status;
4508
4509         /* verify open state */
4510         ctx = nfs_file_open_context(filp);
4511         state = ctx->state;
4512
4513         if (request->fl_start < 0 || request->fl_end < 0)
4514                 return -EINVAL;
4515
4516         if (IS_GETLK(cmd)) {
4517                 if (state != NULL)
4518                         return nfs4_proc_getlk(state, F_GETLK, request);
4519                 return 0;
4520         }
4521
4522         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4523                 return -EINVAL;
4524
4525         if (request->fl_type == F_UNLCK) {
4526                 if (state != NULL)
4527                         return nfs4_proc_unlck(state, cmd, request);
4528                 return 0;
4529         }
4530
4531         if (state == NULL)
4532                 return -ENOLCK;
4533         do {
4534                 status = nfs4_proc_setlk(state, cmd, request);
4535                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4536                         break;
4537                 timeout = nfs4_set_lock_task_retry(timeout);
4538                 status = -ERESTARTSYS;
4539                 if (signalled())
4540                         break;
4541         } while(status < 0);
4542         return status;
4543 }
4544
4545 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4546 {
4547         struct nfs_server *server = NFS_SERVER(state->inode);
4548         struct nfs4_exception exception = { };
4549         int err;
4550
4551         err = nfs4_set_lock_state(state, fl);
4552         if (err != 0)
4553                 goto out;
4554         do {
4555                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4556                 switch (err) {
4557                         default:
4558                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4559                                                 __func__, err);
4560                         case 0:
4561                         case -ESTALE:
4562                                 goto out;
4563                         case -NFS4ERR_EXPIRED:
4564                                 nfs4_schedule_stateid_recovery(server, state);
4565                         case -NFS4ERR_STALE_CLIENTID:
4566                         case -NFS4ERR_STALE_STATEID:
4567                                 nfs4_schedule_lease_recovery(server->nfs_client);
4568                                 goto out;
4569                         case -NFS4ERR_BADSESSION:
4570                         case -NFS4ERR_BADSLOT:
4571                         case -NFS4ERR_BAD_HIGH_SLOT:
4572                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4573                         case -NFS4ERR_DEADSESSION:
4574                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
4575                                 goto out;
4576                         case -ERESTARTSYS:
4577                                 /*
4578                                  * The show must go on: exit, but mark the
4579                                  * stateid as needing recovery.
4580                                  */
4581                         case -NFS4ERR_ADMIN_REVOKED:
4582                         case -NFS4ERR_BAD_STATEID:
4583                         case -NFS4ERR_OPENMODE:
4584                                 nfs4_schedule_stateid_recovery(server, state);
4585                                 err = 0;
4586                                 goto out;
4587                         case -EKEYEXPIRED:
4588                                 /*
4589                                  * User RPCSEC_GSS context has expired.
4590                                  * We cannot recover this stateid now, so
4591                                  * skip it and allow recovery thread to
4592                                  * proceed.
4593                                  */
4594                                 err = 0;
4595                                 goto out;
4596                         case -ENOMEM:
4597                         case -NFS4ERR_DENIED:
4598                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4599                                 err = 0;
4600                                 goto out;
4601                         case -NFS4ERR_DELAY:
4602                                 break;
4603                 }
4604                 err = nfs4_handle_exception(server, err, &exception);
4605         } while (exception.retry);
4606 out:
4607         return err;
4608 }
4609
4610 static void nfs4_release_lockowner_release(void *calldata)
4611 {
4612         kfree(calldata);
4613 }
4614
4615 const struct rpc_call_ops nfs4_release_lockowner_ops = {
4616         .rpc_release = nfs4_release_lockowner_release,
4617 };
4618
4619 void nfs4_release_lockowner(const struct nfs4_lock_state *lsp)
4620 {
4621         struct nfs_server *server = lsp->ls_state->owner->so_server;
4622         struct nfs_release_lockowner_args *args;
4623         struct rpc_message msg = {
4624                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4625         };
4626
4627         if (server->nfs_client->cl_mvops->minor_version != 0)
4628                 return;
4629         args = kmalloc(sizeof(*args), GFP_NOFS);
4630         if (!args)
4631                 return;
4632         args->lock_owner.clientid = server->nfs_client->cl_clientid;
4633         args->lock_owner.id = lsp->ls_id.id;
4634         args->lock_owner.s_dev = server->s_dev;
4635         msg.rpc_argp = args;
4636         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, args);
4637 }
4638
4639 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4640
4641 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4642                                    const void *buf, size_t buflen,
4643                                    int flags, int type)
4644 {
4645         if (strcmp(key, "") != 0)
4646                 return -EINVAL;
4647
4648         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
4649 }
4650
4651 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
4652                                    void *buf, size_t buflen, int type)
4653 {
4654         if (strcmp(key, "") != 0)
4655                 return -EINVAL;
4656
4657         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
4658 }
4659
4660 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
4661                                        size_t list_len, const char *name,
4662                                        size_t name_len, int type)
4663 {
4664         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
4665
4666         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4667                 return 0;
4668
4669         if (list && len <= list_len)
4670                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
4671         return len;
4672 }
4673
4674 /*
4675  * nfs_fhget will use either the mounted_on_fileid or the fileid
4676  */
4677 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4678 {
4679         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
4680                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
4681               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4682               (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4683                 return;
4684
4685         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4686                 NFS_ATTR_FATTR_NLINK;
4687         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4688         fattr->nlink = 2;
4689 }
4690
4691 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4692                 struct nfs4_fs_locations *fs_locations, struct page *page)
4693 {
4694         struct nfs_server *server = NFS_SERVER(dir);
4695         u32 bitmask[2] = {
4696                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4697         };
4698         struct nfs4_fs_locations_arg args = {
4699                 .dir_fh = NFS_FH(dir),
4700                 .name = name,
4701                 .page = page,
4702                 .bitmask = bitmask,
4703         };
4704         struct nfs4_fs_locations_res res = {
4705                 .fs_locations = fs_locations,
4706         };
4707         struct rpc_message msg = {
4708                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4709                 .rpc_argp = &args,
4710                 .rpc_resp = &res,
4711         };
4712         int status;
4713
4714         dprintk("%s: start\n", __func__);
4715
4716         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
4717          * is not supported */
4718         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
4719                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
4720         else
4721                 bitmask[0] |= FATTR4_WORD0_FILEID;
4722
4723         nfs_fattr_init(&fs_locations->fattr);
4724         fs_locations->server = server;
4725         fs_locations->nlocations = 0;
4726         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4727         dprintk("%s: returned status = %d\n", __func__, status);
4728         return status;
4729 }
4730
4731 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4732 {
4733         int status;
4734         struct nfs4_secinfo_arg args = {
4735                 .dir_fh = NFS_FH(dir),
4736                 .name   = name,
4737         };
4738         struct nfs4_secinfo_res res = {
4739                 .flavors     = flavors,
4740         };
4741         struct rpc_message msg = {
4742                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
4743                 .rpc_argp = &args,
4744                 .rpc_resp = &res,
4745         };
4746
4747         dprintk("NFS call  secinfo %s\n", name->name);
4748         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
4749         dprintk("NFS reply  secinfo: %d\n", status);
4750         return status;
4751 }
4752
4753 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4754 {
4755         struct nfs4_exception exception = { };
4756         int err;
4757         do {
4758                 err = nfs4_handle_exception(NFS_SERVER(dir),
4759                                 _nfs4_proc_secinfo(dir, name, flavors),
4760                                 &exception);
4761         } while (exception.retry);
4762         return err;
4763 }
4764
4765 #ifdef CONFIG_NFS_V4_1
4766 /*
4767  * Check the exchange flags returned by the server for invalid flags, having
4768  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
4769  * DS flags set.
4770  */
4771 static int nfs4_check_cl_exchange_flags(u32 flags)
4772 {
4773         if (flags & ~EXCHGID4_FLAG_MASK_R)
4774                 goto out_inval;
4775         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
4776             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
4777                 goto out_inval;
4778         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
4779                 goto out_inval;
4780         return NFS_OK;
4781 out_inval:
4782         return -NFS4ERR_INVAL;
4783 }
4784
4785 static bool
4786 nfs41_same_server_scope(struct server_scope *a, struct server_scope *b)
4787 {
4788         if (a->server_scope_sz == b->server_scope_sz &&
4789             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
4790                 return true;
4791
4792         return false;
4793 }
4794
4795 /*
4796  * nfs4_proc_exchange_id()
4797  *
4798  * Since the clientid has expired, all compounds using sessions
4799  * associated with the stale clientid will be returning
4800  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4801  * be in some phase of session reset.
4802  */
4803 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4804 {
4805         nfs4_verifier verifier;
4806         struct nfs41_exchange_id_args args = {
4807                 .client = clp,
4808                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
4809         };
4810         struct nfs41_exchange_id_res res = {
4811                 .client = clp,
4812         };
4813         int status;
4814         struct rpc_message msg = {
4815                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4816                 .rpc_argp = &args,
4817                 .rpc_resp = &res,
4818                 .rpc_cred = cred,
4819         };
4820         __be32 *p;
4821
4822         dprintk("--> %s\n", __func__);
4823         BUG_ON(clp == NULL);
4824
4825         p = (u32 *)verifier.data;
4826         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4827         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4828         args.verifier = &verifier;
4829
4830         args.id_len = scnprintf(args.id, sizeof(args.id),
4831                                 "%s/%s.%s/%u",
4832                                 clp->cl_ipaddr,
4833                                 init_utsname()->nodename,
4834                                 init_utsname()->domainname,
4835                                 clp->cl_rpcclient->cl_auth->au_flavor);
4836
4837         res.server_scope = kzalloc(sizeof(struct server_scope), GFP_KERNEL);
4838         if (unlikely(!res.server_scope))
4839                 return -ENOMEM;
4840
4841         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4842         if (!status)
4843                 status = nfs4_check_cl_exchange_flags(clp->cl_exchange_flags);
4844
4845         if (!status) {
4846                 if (clp->server_scope &&
4847                     !nfs41_same_server_scope(clp->server_scope,
4848                                              res.server_scope)) {
4849                         dprintk("%s: server_scope mismatch detected\n",
4850                                 __func__);
4851                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
4852                         kfree(clp->server_scope);
4853                         clp->server_scope = NULL;
4854                 }
4855
4856                 if (!clp->server_scope)
4857                         clp->server_scope = res.server_scope;
4858                 else
4859                         kfree(res.server_scope);
4860         }
4861
4862         dprintk("<-- %s status= %d\n", __func__, status);
4863         return status;
4864 }
4865
4866 struct nfs4_get_lease_time_data {
4867         struct nfs4_get_lease_time_args *args;
4868         struct nfs4_get_lease_time_res *res;
4869         struct nfs_client *clp;
4870 };
4871
4872 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4873                                         void *calldata)
4874 {
4875         int ret;
4876         struct nfs4_get_lease_time_data *data =
4877                         (struct nfs4_get_lease_time_data *)calldata;
4878
4879         dprintk("--> %s\n", __func__);
4880         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4881         /* just setup sequence, do not trigger session recovery
4882            since we're invoked within one */
4883         ret = nfs41_setup_sequence(data->clp->cl_session,
4884                                    &data->args->la_seq_args,
4885                                    &data->res->lr_seq_res, 0, task);
4886
4887         BUG_ON(ret == -EAGAIN);
4888         rpc_call_start(task);
4889         dprintk("<-- %s\n", __func__);
4890 }
4891
4892 /*
4893  * Called from nfs4_state_manager thread for session setup, so don't recover
4894  * from sequence operation or clientid errors.
4895  */
4896 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4897 {
4898         struct nfs4_get_lease_time_data *data =
4899                         (struct nfs4_get_lease_time_data *)calldata;
4900
4901         dprintk("--> %s\n", __func__);
4902         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
4903                 return;
4904         switch (task->tk_status) {
4905         case -NFS4ERR_DELAY:
4906         case -NFS4ERR_GRACE:
4907                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4908                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4909                 task->tk_status = 0;
4910                 /* fall through */
4911         case -NFS4ERR_RETRY_UNCACHED_REP:
4912                 nfs_restart_rpc(task, data->clp);
4913                 return;
4914         }
4915         dprintk("<-- %s\n", __func__);
4916 }
4917
4918 struct rpc_call_ops nfs4_get_lease_time_ops = {
4919         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4920         .rpc_call_done = nfs4_get_lease_time_done,
4921 };
4922
4923 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4924 {
4925         struct rpc_task *task;
4926         struct nfs4_get_lease_time_args args;
4927         struct nfs4_get_lease_time_res res = {
4928                 .lr_fsinfo = fsinfo,
4929         };
4930         struct nfs4_get_lease_time_data data = {
4931                 .args = &args,
4932                 .res = &res,
4933                 .clp = clp,
4934         };
4935         struct rpc_message msg = {
4936                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4937                 .rpc_argp = &args,
4938                 .rpc_resp = &res,
4939         };
4940         struct rpc_task_setup task_setup = {
4941                 .rpc_client = clp->cl_rpcclient,
4942                 .rpc_message = &msg,
4943                 .callback_ops = &nfs4_get_lease_time_ops,
4944                 .callback_data = &data,
4945                 .flags = RPC_TASK_TIMEOUT,
4946         };
4947         int status;
4948
4949         dprintk("--> %s\n", __func__);
4950         task = rpc_run_task(&task_setup);
4951
4952         if (IS_ERR(task))
4953                 status = PTR_ERR(task);
4954         else {
4955                 status = task->tk_status;
4956                 rpc_put_task(task);
4957         }
4958         dprintk("<-- %s return %d\n", __func__, status);
4959
4960         return status;
4961 }
4962
4963 /*
4964  * Reset a slot table
4965  */
4966 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
4967                                  int ivalue)
4968 {
4969         struct nfs4_slot *new = NULL;
4970         int i;
4971         int ret = 0;
4972
4973         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
4974                 max_reqs, tbl->max_slots);
4975
4976         /* Does the newly negotiated max_reqs match the existing slot table? */
4977         if (max_reqs != tbl->max_slots) {
4978                 ret = -ENOMEM;
4979                 new = kmalloc(max_reqs * sizeof(struct nfs4_slot),
4980                               GFP_NOFS);
4981                 if (!new)
4982                         goto out;
4983                 ret = 0;
4984                 kfree(tbl->slots);
4985         }
4986         spin_lock(&tbl->slot_tbl_lock);
4987         if (new) {
4988                 tbl->slots = new;
4989                 tbl->max_slots = max_reqs;
4990         }
4991         for (i = 0; i < tbl->max_slots; ++i)
4992                 tbl->slots[i].seq_nr = ivalue;
4993         spin_unlock(&tbl->slot_tbl_lock);
4994         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4995                 tbl, tbl->slots, tbl->max_slots);
4996 out:
4997         dprintk("<-- %s: return %d\n", __func__, ret);
4998         return ret;
4999 }
5000
5001 /*
5002  * Reset the forechannel and backchannel slot tables
5003  */
5004 static int nfs4_reset_slot_tables(struct nfs4_session *session)
5005 {
5006         int status;
5007
5008         status = nfs4_reset_slot_table(&session->fc_slot_table,
5009                         session->fc_attrs.max_reqs, 1);
5010         if (status)
5011                 return status;
5012
5013         status = nfs4_reset_slot_table(&session->bc_slot_table,
5014                         session->bc_attrs.max_reqs, 0);
5015         return status;
5016 }
5017
5018 /* Destroy the slot table */
5019 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
5020 {
5021         if (session->fc_slot_table.slots != NULL) {
5022                 kfree(session->fc_slot_table.slots);
5023                 session->fc_slot_table.slots = NULL;
5024         }
5025         if (session->bc_slot_table.slots != NULL) {
5026                 kfree(session->bc_slot_table.slots);
5027                 session->bc_slot_table.slots = NULL;
5028         }
5029         return;
5030 }
5031
5032 /*
5033  * Initialize slot table
5034  */
5035 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
5036                 int max_slots, int ivalue)
5037 {
5038         struct nfs4_slot *slot;
5039         int ret = -ENOMEM;
5040
5041         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
5042
5043         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
5044
5045         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_NOFS);
5046         if (!slot)
5047                 goto out;
5048         ret = 0;
5049
5050         spin_lock(&tbl->slot_tbl_lock);
5051         tbl->max_slots = max_slots;
5052         tbl->slots = slot;
5053         tbl->highest_used_slotid = -1;  /* no slot is currently used */
5054         spin_unlock(&tbl->slot_tbl_lock);
5055         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5056                 tbl, tbl->slots, tbl->max_slots);
5057 out:
5058         dprintk("<-- %s: return %d\n", __func__, ret);
5059         return ret;
5060 }
5061
5062 /*
5063  * Initialize the forechannel and backchannel tables
5064  */
5065 static int nfs4_init_slot_tables(struct nfs4_session *session)
5066 {
5067         struct nfs4_slot_table *tbl;
5068         int status = 0;
5069
5070         tbl = &session->fc_slot_table;
5071         if (tbl->slots == NULL) {
5072                 status = nfs4_init_slot_table(tbl,
5073                                 session->fc_attrs.max_reqs, 1);
5074                 if (status)
5075                         return status;
5076         }
5077
5078         tbl = &session->bc_slot_table;
5079         if (tbl->slots == NULL) {
5080                 status = nfs4_init_slot_table(tbl,
5081                                 session->bc_attrs.max_reqs, 0);
5082                 if (status)
5083                         nfs4_destroy_slot_tables(session);
5084         }
5085
5086         return status;
5087 }
5088
5089 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
5090 {
5091         struct nfs4_session *session;
5092         struct nfs4_slot_table *tbl;
5093
5094         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5095         if (!session)
5096                 return NULL;
5097
5098         tbl = &session->fc_slot_table;
5099         tbl->highest_used_slotid = -1;
5100         spin_lock_init(&tbl->slot_tbl_lock);
5101         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
5102         init_completion(&tbl->complete);
5103
5104         tbl = &session->bc_slot_table;
5105         tbl->highest_used_slotid = -1;
5106         spin_lock_init(&tbl->slot_tbl_lock);
5107         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
5108         init_completion(&tbl->complete);
5109
5110         session->session_state = 1<<NFS4_SESSION_INITING;
5111
5112         session->clp = clp;
5113         return session;
5114 }
5115
5116 void nfs4_destroy_session(struct nfs4_session *session)
5117 {
5118         nfs4_proc_destroy_session(session);
5119         dprintk("%s Destroy backchannel for xprt %p\n",
5120                 __func__, session->clp->cl_rpcclient->cl_xprt);
5121         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
5122                                 NFS41_BC_MIN_CALLBACKS);
5123         nfs4_destroy_slot_tables(session);
5124         kfree(session);
5125 }
5126
5127 /*
5128  * Initialize the values to be used by the client in CREATE_SESSION
5129  * If nfs4_init_session set the fore channel request and response sizes,
5130  * use them.
5131  *
5132  * Set the back channel max_resp_sz_cached to zero to force the client to
5133  * always set csa_cachethis to FALSE because the current implementation
5134  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5135  */
5136 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5137 {
5138         struct nfs4_session *session = args->client->cl_session;
5139         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
5140                      mxresp_sz = session->fc_attrs.max_resp_sz;
5141
5142         if (mxrqst_sz == 0)
5143                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5144         if (mxresp_sz == 0)
5145                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5146         /* Fore channel attributes */
5147         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5148         args->fc_attrs.max_resp_sz = mxresp_sz;
5149         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5150         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
5151
5152         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5153                 "max_ops=%u max_reqs=%u\n",
5154                 __func__,
5155                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5156                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5157
5158         /* Back channel attributes */
5159         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5160         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5161         args->bc_attrs.max_resp_sz_cached = 0;
5162         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5163         args->bc_attrs.max_reqs = 1;
5164
5165         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5166                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5167                 __func__,
5168                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5169                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5170                 args->bc_attrs.max_reqs);
5171 }
5172
5173 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5174 {
5175         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5176         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5177
5178         if (rcvd->max_resp_sz > sent->max_resp_sz)
5179                 return -EINVAL;
5180         /*
5181          * Our requested max_ops is the minimum we need; we're not
5182          * prepared to break up compounds into smaller pieces than that.
5183          * So, no point even trying to continue if the server won't
5184          * cooperate:
5185          */
5186         if (rcvd->max_ops < sent->max_ops)
5187                 return -EINVAL;
5188         if (rcvd->max_reqs == 0)
5189                 return -EINVAL;
5190         return 0;
5191 }
5192
5193 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5194 {
5195         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5196         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5197
5198         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5199                 return -EINVAL;
5200         if (rcvd->max_resp_sz < sent->max_resp_sz)
5201                 return -EINVAL;
5202         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5203                 return -EINVAL;
5204         /* These would render the backchannel useless: */
5205         if (rcvd->max_ops  == 0)
5206                 return -EINVAL;
5207         if (rcvd->max_reqs == 0)
5208                 return -EINVAL;
5209         return 0;
5210 }
5211
5212 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5213                                      struct nfs4_session *session)
5214 {
5215         int ret;
5216
5217         ret = nfs4_verify_fore_channel_attrs(args, session);
5218         if (ret)
5219                 return ret;
5220         return nfs4_verify_back_channel_attrs(args, session);
5221 }
5222
5223 static int _nfs4_proc_create_session(struct nfs_client *clp)
5224 {
5225         struct nfs4_session *session = clp->cl_session;
5226         struct nfs41_create_session_args args = {
5227                 .client = clp,
5228                 .cb_program = NFS4_CALLBACK,
5229         };
5230         struct nfs41_create_session_res res = {
5231                 .client = clp,
5232         };
5233         struct rpc_message msg = {
5234                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5235                 .rpc_argp = &args,
5236                 .rpc_resp = &res,
5237         };
5238         int status;
5239
5240         nfs4_init_channel_attrs(&args);
5241         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5242
5243         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5244
5245         if (!status)
5246                 /* Verify the session's negotiated channel_attrs values */
5247                 status = nfs4_verify_channel_attrs(&args, session);
5248         if (!status) {
5249                 /* Increment the clientid slot sequence id */
5250                 clp->cl_seqid++;
5251         }
5252
5253         return status;
5254 }
5255
5256 /*
5257  * Issues a CREATE_SESSION operation to the server.
5258  * It is the responsibility of the caller to verify the session is
5259  * expired before calling this routine.
5260  */
5261 int nfs4_proc_create_session(struct nfs_client *clp)
5262 {
5263         int status;
5264         unsigned *ptr;
5265         struct nfs4_session *session = clp->cl_session;
5266
5267         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5268
5269         status = _nfs4_proc_create_session(clp);
5270         if (status)
5271                 goto out;
5272
5273         /* Init and reset the fore channel */
5274         status = nfs4_init_slot_tables(session);
5275         dprintk("slot table initialization returned %d\n", status);
5276         if (status)
5277                 goto out;
5278         status = nfs4_reset_slot_tables(session);
5279         dprintk("slot table reset returned %d\n", status);
5280         if (status)
5281                 goto out;
5282
5283         ptr = (unsigned *)&session->sess_id.data[0];
5284         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5285                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5286 out:
5287         dprintk("<-- %s\n", __func__);
5288         return status;
5289 }
5290
5291 /*
5292  * Issue the over-the-wire RPC DESTROY_SESSION.
5293  * The caller must serialize access to this routine.
5294  */
5295 int nfs4_proc_destroy_session(struct nfs4_session *session)
5296 {
5297         int status = 0;
5298         struct rpc_message msg;
5299
5300         dprintk("--> nfs4_proc_destroy_session\n");
5301
5302         /* session is still being setup */
5303         if (session->clp->cl_cons_state != NFS_CS_READY)
5304                 return status;
5305
5306         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
5307         msg.rpc_argp = session;
5308         msg.rpc_resp = NULL;
5309         msg.rpc_cred = NULL;
5310         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5311
5312         if (status)
5313                 printk(KERN_WARNING
5314                         "Got error %d from the server on DESTROY_SESSION. "
5315                         "Session has been destroyed regardless...\n", status);
5316
5317         dprintk("<-- nfs4_proc_destroy_session\n");
5318         return status;
5319 }
5320
5321 int nfs4_init_session(struct nfs_server *server)
5322 {
5323         struct nfs_client *clp = server->nfs_client;
5324         struct nfs4_session *session;
5325         unsigned int rsize, wsize;
5326         int ret;
5327
5328         if (!nfs4_has_session(clp))
5329                 return 0;
5330
5331         session = clp->cl_session;
5332         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5333                 return 0;
5334
5335         rsize = server->rsize;
5336         if (rsize == 0)
5337                 rsize = NFS_MAX_FILE_IO_SIZE;
5338         wsize = server->wsize;
5339         if (wsize == 0)
5340                 wsize = NFS_MAX_FILE_IO_SIZE;
5341
5342         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5343         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5344
5345         ret = nfs4_recover_expired_lease(server);
5346         if (!ret)
5347                 ret = nfs4_check_client_ready(clp);
5348         return ret;
5349 }
5350
5351 int nfs4_init_ds_session(struct nfs_client *clp)
5352 {
5353         struct nfs4_session *session = clp->cl_session;
5354         int ret;
5355
5356         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5357                 return 0;
5358
5359         ret = nfs4_client_recover_expired_lease(clp);
5360         if (!ret)
5361                 /* Test for the DS role */
5362                 if (!is_ds_client(clp))
5363                         ret = -ENODEV;
5364         if (!ret)
5365                 ret = nfs4_check_client_ready(clp);
5366         return ret;
5367
5368 }
5369 EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
5370
5371
5372 /*
5373  * Renew the cl_session lease.
5374  */
5375 struct nfs4_sequence_data {
5376         struct nfs_client *clp;
5377         struct nfs4_sequence_args args;
5378         struct nfs4_sequence_res res;
5379 };
5380
5381 static void nfs41_sequence_release(void *data)
5382 {
5383         struct nfs4_sequence_data *calldata = data;
5384         struct nfs_client *clp = calldata->clp;
5385
5386         if (atomic_read(&clp->cl_count) > 1)
5387                 nfs4_schedule_state_renewal(clp);
5388         nfs_put_client(clp);
5389         kfree(calldata);
5390 }
5391
5392 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5393 {
5394         switch(task->tk_status) {
5395         case -NFS4ERR_DELAY:
5396                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5397                 return -EAGAIN;
5398         default:
5399                 nfs4_schedule_lease_recovery(clp);
5400         }
5401         return 0;
5402 }
5403
5404 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5405 {
5406         struct nfs4_sequence_data *calldata = data;
5407         struct nfs_client *clp = calldata->clp;
5408
5409         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5410                 return;
5411
5412         if (task->tk_status < 0) {
5413                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5414                 if (atomic_read(&clp->cl_count) == 1)
5415                         goto out;
5416
5417                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5418                         rpc_restart_call_prepare(task);
5419                         return;
5420                 }
5421         }
5422         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5423 out:
5424         dprintk("<-- %s\n", __func__);
5425 }
5426
5427 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5428 {
5429         struct nfs4_sequence_data *calldata = data;
5430         struct nfs_client *clp = calldata->clp;
5431         struct nfs4_sequence_args *args;
5432         struct nfs4_sequence_res *res;
5433
5434         args = task->tk_msg.rpc_argp;
5435         res = task->tk_msg.rpc_resp;
5436
5437         if (nfs41_setup_sequence(clp->cl_session, args, res, 0, task))
5438                 return;
5439         rpc_call_start(task);
5440 }
5441
5442 static const struct rpc_call_ops nfs41_sequence_ops = {
5443         .rpc_call_done = nfs41_sequence_call_done,
5444         .rpc_call_prepare = nfs41_sequence_prepare,
5445         .rpc_release = nfs41_sequence_release,
5446 };
5447
5448 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5449 {
5450         struct nfs4_sequence_data *calldata;
5451         struct rpc_message msg = {
5452                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5453                 .rpc_cred = cred,
5454         };
5455         struct rpc_task_setup task_setup_data = {
5456                 .rpc_client = clp->cl_rpcclient,
5457                 .rpc_message = &msg,
5458                 .callback_ops = &nfs41_sequence_ops,
5459                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5460         };
5461
5462         if (!atomic_inc_not_zero(&clp->cl_count))
5463                 return ERR_PTR(-EIO);
5464         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5465         if (calldata == NULL) {
5466                 nfs_put_client(clp);
5467                 return ERR_PTR(-ENOMEM);
5468         }
5469         msg.rpc_argp = &calldata->args;
5470         msg.rpc_resp = &calldata->res;
5471         calldata->clp = clp;
5472         task_setup_data.callback_data = calldata;
5473
5474         return rpc_run_task(&task_setup_data);
5475 }
5476
5477 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5478 {
5479         struct rpc_task *task;
5480         int ret = 0;
5481
5482         task = _nfs41_proc_sequence(clp, cred);
5483         if (IS_ERR(task))
5484                 ret = PTR_ERR(task);
5485         else
5486                 rpc_put_task_async(task);
5487         dprintk("<-- %s status=%d\n", __func__, ret);
5488         return ret;
5489 }
5490
5491 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5492 {
5493         struct rpc_task *task;
5494         int ret;
5495
5496         task = _nfs41_proc_sequence(clp, cred);
5497         if (IS_ERR(task)) {
5498                 ret = PTR_ERR(task);
5499                 goto out;
5500         }
5501         ret = rpc_wait_for_completion_task(task);
5502         if (!ret) {
5503                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5504
5505                 if (task->tk_status == 0)
5506                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5507                 ret = task->tk_status;
5508         }
5509         rpc_put_task(task);
5510 out:
5511         dprintk("<-- %s status=%d\n", __func__, ret);
5512         return ret;
5513 }
5514
5515 struct nfs4_reclaim_complete_data {
5516         struct nfs_client *clp;
5517         struct nfs41_reclaim_complete_args arg;
5518         struct nfs41_reclaim_complete_res res;
5519 };
5520
5521 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5522 {
5523         struct nfs4_reclaim_complete_data *calldata = data;
5524
5525         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5526         if (nfs41_setup_sequence(calldata->clp->cl_session,
5527                                 &calldata->arg.seq_args,
5528                                 &calldata->res.seq_res, 0, task))
5529                 return;
5530
5531         rpc_call_start(task);
5532 }
5533
5534 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5535 {
5536         switch(task->tk_status) {
5537         case 0:
5538         case -NFS4ERR_COMPLETE_ALREADY:
5539         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5540                 break;
5541         case -NFS4ERR_DELAY:
5542                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5543                 /* fall through */
5544         case -NFS4ERR_RETRY_UNCACHED_REP:
5545                 return -EAGAIN;
5546         default:
5547                 nfs4_schedule_lease_recovery(clp);
5548         }
5549         return 0;
5550 }
5551
5552 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5553 {
5554         struct nfs4_reclaim_complete_data *calldata = data;
5555         struct nfs_client *clp = calldata->clp;
5556         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5557
5558         dprintk("--> %s\n", __func__);
5559         if (!nfs41_sequence_done(task, res))
5560                 return;
5561
5562         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5563                 rpc_restart_call_prepare(task);
5564                 return;
5565         }
5566         dprintk("<-- %s\n", __func__);
5567 }
5568
5569 static void nfs4_free_reclaim_complete_data(void *data)
5570 {
5571         struct nfs4_reclaim_complete_data *calldata = data;
5572
5573         kfree(calldata);
5574 }
5575
5576 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5577         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5578         .rpc_call_done = nfs4_reclaim_complete_done,
5579         .rpc_release = nfs4_free_reclaim_complete_data,
5580 };
5581
5582 /*
5583  * Issue a global reclaim complete.
5584  */
5585 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5586 {
5587         struct nfs4_reclaim_complete_data *calldata;
5588         struct rpc_task *task;
5589         struct rpc_message msg = {
5590                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5591         };
5592         struct rpc_task_setup task_setup_data = {
5593                 .rpc_client = clp->cl_rpcclient,
5594                 .rpc_message = &msg,
5595                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5596                 .flags = RPC_TASK_ASYNC,
5597         };
5598         int status = -ENOMEM;
5599
5600         dprintk("--> %s\n", __func__);
5601         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5602         if (calldata == NULL)
5603                 goto out;
5604         calldata->clp = clp;
5605         calldata->arg.one_fs = 0;
5606
5607         msg.rpc_argp = &calldata->arg;
5608         msg.rpc_resp = &calldata->res;
5609         task_setup_data.callback_data = calldata;
5610         task = rpc_run_task(&task_setup_data);
5611         if (IS_ERR(task)) {
5612                 status = PTR_ERR(task);
5613                 goto out;
5614         }
5615         status = nfs4_wait_for_completion_rpc_task(task);
5616         if (status == 0)
5617                 status = task->tk_status;
5618         rpc_put_task(task);
5619         return 0;
5620 out:
5621         dprintk("<-- %s status=%d\n", __func__, status);
5622         return status;
5623 }
5624
5625 static void
5626 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5627 {
5628         struct nfs4_layoutget *lgp = calldata;
5629         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5630
5631         dprintk("--> %s\n", __func__);
5632         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
5633          * right now covering the LAYOUTGET we are about to send.
5634          * However, that is not so catastrophic, and there seems
5635          * to be no way to prevent it completely.
5636          */
5637         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
5638                                 &lgp->res.seq_res, 0, task))
5639                 return;
5640         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
5641                                           NFS_I(lgp->args.inode)->layout,
5642                                           lgp->args.ctx->state)) {
5643                 rpc_exit(task, NFS4_OK);
5644                 return;
5645         }
5646         rpc_call_start(task);
5647 }
5648
5649 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
5650 {
5651         struct nfs4_layoutget *lgp = calldata;
5652         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5653
5654         dprintk("--> %s\n", __func__);
5655
5656         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
5657                 return;
5658
5659         switch (task->tk_status) {
5660         case 0:
5661                 break;
5662         case -NFS4ERR_LAYOUTTRYLATER:
5663         case -NFS4ERR_RECALLCONFLICT:
5664                 task->tk_status = -NFS4ERR_DELAY;
5665                 /* Fall through */
5666         default:
5667                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5668                         rpc_restart_call_prepare(task);
5669                         return;
5670                 }
5671         }
5672         dprintk("<-- %s\n", __func__);
5673 }
5674
5675 static void nfs4_layoutget_release(void *calldata)
5676 {
5677         struct nfs4_layoutget *lgp = calldata;
5678
5679         dprintk("--> %s\n", __func__);
5680         put_nfs_open_context(lgp->args.ctx);
5681         kfree(calldata);
5682         dprintk("<-- %s\n", __func__);
5683 }
5684
5685 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
5686         .rpc_call_prepare = nfs4_layoutget_prepare,
5687         .rpc_call_done = nfs4_layoutget_done,
5688         .rpc_release = nfs4_layoutget_release,
5689 };
5690
5691 int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
5692 {
5693         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5694         struct rpc_task *task;
5695         struct rpc_message msg = {
5696                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
5697                 .rpc_argp = &lgp->args,
5698                 .rpc_resp = &lgp->res,
5699         };
5700         struct rpc_task_setup task_setup_data = {
5701                 .rpc_client = server->client,
5702                 .rpc_message = &msg,
5703                 .callback_ops = &nfs4_layoutget_call_ops,
5704                 .callback_data = lgp,
5705                 .flags = RPC_TASK_ASYNC,
5706         };
5707         int status = 0;
5708
5709         dprintk("--> %s\n", __func__);
5710
5711         lgp->res.layoutp = &lgp->args.layout;
5712         lgp->res.seq_res.sr_slot = NULL;
5713         task = rpc_run_task(&task_setup_data);
5714         if (IS_ERR(task))
5715                 return PTR_ERR(task);
5716         status = nfs4_wait_for_completion_rpc_task(task);
5717         if (status == 0)
5718                 status = task->tk_status;
5719         if (status == 0)
5720                 status = pnfs_layout_process(lgp);
5721         rpc_put_task(task);
5722         dprintk("<-- %s status=%d\n", __func__, status);
5723         return status;
5724 }
5725
5726 static void
5727 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
5728 {
5729         struct nfs4_layoutreturn *lrp = calldata;
5730
5731         dprintk("--> %s\n", __func__);
5732         if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
5733                                 &lrp->res.seq_res, 0, task))
5734                 return;
5735         rpc_call_start(task);
5736 }
5737
5738 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
5739 {
5740         struct nfs4_layoutreturn *lrp = calldata;
5741         struct nfs_server *server;
5742         struct pnfs_layout_hdr *lo = NFS_I(lrp->args.inode)->layout;
5743
5744         dprintk("--> %s\n", __func__);
5745
5746         if (!nfs4_sequence_done(task, &lrp->res.seq_res))
5747                 return;
5748
5749         server = NFS_SERVER(lrp->args.inode);
5750         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5751                 nfs_restart_rpc(task, lrp->clp);
5752                 return;
5753         }
5754         spin_lock(&lo->plh_inode->i_lock);
5755         if (task->tk_status == 0) {
5756                 if (lrp->res.lrs_present) {
5757                         pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
5758                 } else
5759                         BUG_ON(!list_empty(&lo->plh_segs));
5760         }
5761         lo->plh_block_lgets--;
5762         spin_unlock(&lo->plh_inode->i_lock);
5763         dprintk("<-- %s\n", __func__);
5764 }
5765
5766 static void nfs4_layoutreturn_release(void *calldata)
5767 {
5768         struct nfs4_layoutreturn *lrp = calldata;
5769
5770         dprintk("--> %s\n", __func__);
5771         put_layout_hdr(NFS_I(lrp->args.inode)->layout);
5772         kfree(calldata);
5773         dprintk("<-- %s\n", __func__);
5774 }
5775
5776 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
5777         .rpc_call_prepare = nfs4_layoutreturn_prepare,
5778         .rpc_call_done = nfs4_layoutreturn_done,
5779         .rpc_release = nfs4_layoutreturn_release,
5780 };
5781
5782 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
5783 {
5784         struct rpc_task *task;
5785         struct rpc_message msg = {
5786                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
5787                 .rpc_argp = &lrp->args,
5788                 .rpc_resp = &lrp->res,
5789         };
5790         struct rpc_task_setup task_setup_data = {
5791                 .rpc_client = lrp->clp->cl_rpcclient,
5792                 .rpc_message = &msg,
5793                 .callback_ops = &nfs4_layoutreturn_call_ops,
5794                 .callback_data = lrp,
5795         };
5796         int status;
5797
5798         dprintk("--> %s\n", __func__);
5799         task = rpc_run_task(&task_setup_data);
5800         if (IS_ERR(task))
5801                 return PTR_ERR(task);
5802         status = task->tk_status;
5803         dprintk("<-- %s status=%d\n", __func__, status);
5804         rpc_put_task(task);
5805         return status;
5806 }
5807
5808 static int
5809 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5810 {
5811         struct nfs4_getdeviceinfo_args args = {
5812                 .pdev = pdev,
5813         };
5814         struct nfs4_getdeviceinfo_res res = {
5815                 .pdev = pdev,
5816         };
5817         struct rpc_message msg = {
5818                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
5819                 .rpc_argp = &args,
5820                 .rpc_resp = &res,
5821         };
5822         int status;
5823
5824         dprintk("--> %s\n", __func__);
5825         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5826         dprintk("<-- %s status=%d\n", __func__, status);
5827
5828         return status;
5829 }
5830
5831 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5832 {
5833         struct nfs4_exception exception = { };
5834         int err;
5835
5836         do {
5837                 err = nfs4_handle_exception(server,
5838                                         _nfs4_proc_getdeviceinfo(server, pdev),
5839                                         &exception);
5840         } while (exception.retry);
5841         return err;
5842 }
5843 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
5844
5845 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
5846 {
5847         struct nfs4_layoutcommit_data *data = calldata;
5848         struct nfs_server *server = NFS_SERVER(data->args.inode);
5849
5850         if (nfs4_setup_sequence(server, &data->args.seq_args,
5851                                 &data->res.seq_res, 1, task))
5852                 return;
5853         rpc_call_start(task);
5854 }
5855
5856 static void
5857 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
5858 {
5859         struct nfs4_layoutcommit_data *data = calldata;
5860         struct nfs_server *server = NFS_SERVER(data->args.inode);
5861
5862         if (!nfs4_sequence_done(task, &data->res.seq_res))
5863                 return;
5864
5865         switch (task->tk_status) { /* Just ignore these failures */
5866         case NFS4ERR_DELEG_REVOKED: /* layout was recalled */
5867         case NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
5868         case NFS4ERR_BADLAYOUT:     /* no layout */
5869         case NFS4ERR_GRACE:         /* loca_recalim always false */
5870                 task->tk_status = 0;
5871         }
5872
5873         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5874                 nfs_restart_rpc(task, server->nfs_client);
5875                 return;
5876         }
5877
5878         if (task->tk_status == 0)
5879                 nfs_post_op_update_inode_force_wcc(data->args.inode,
5880                                                    data->res.fattr);
5881 }
5882
5883 static void nfs4_layoutcommit_release(void *calldata)
5884 {
5885         struct nfs4_layoutcommit_data *data = calldata;
5886
5887         /* Matched by references in pnfs_set_layoutcommit */
5888         put_lseg(data->lseg);
5889         put_rpccred(data->cred);
5890         kfree(data);
5891 }
5892
5893 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
5894         .rpc_call_prepare = nfs4_layoutcommit_prepare,
5895         .rpc_call_done = nfs4_layoutcommit_done,
5896         .rpc_release = nfs4_layoutcommit_release,
5897 };
5898
5899 int
5900 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
5901 {
5902         struct rpc_message msg = {
5903                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
5904                 .rpc_argp = &data->args,
5905                 .rpc_resp = &data->res,
5906                 .rpc_cred = data->cred,
5907         };
5908         struct rpc_task_setup task_setup_data = {
5909                 .task = &data->task,
5910                 .rpc_client = NFS_CLIENT(data->args.inode),
5911                 .rpc_message = &msg,
5912                 .callback_ops = &nfs4_layoutcommit_ops,
5913                 .callback_data = data,
5914                 .flags = RPC_TASK_ASYNC,
5915         };
5916         struct rpc_task *task;
5917         int status = 0;
5918
5919         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
5920                 "lbw: %llu inode %lu\n",
5921                 data->task.tk_pid, sync,
5922                 data->args.lastbytewritten,
5923                 data->args.inode->i_ino);
5924
5925         task = rpc_run_task(&task_setup_data);
5926         if (IS_ERR(task))
5927                 return PTR_ERR(task);
5928         if (sync == false)
5929                 goto out;
5930         status = nfs4_wait_for_completion_rpc_task(task);
5931         if (status != 0)
5932                 goto out;
5933         status = task->tk_status;
5934 out:
5935         dprintk("%s: status %d\n", __func__, status);
5936         rpc_put_task(task);
5937         return status;
5938 }
5939
5940 static int
5941 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
5942                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
5943 {
5944         struct nfs41_secinfo_no_name_args args = {
5945                 .style = SECINFO_STYLE_CURRENT_FH,
5946         };
5947         struct nfs4_secinfo_res res = {
5948                 .flavors = flavors,
5949         };
5950         struct rpc_message msg = {
5951                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
5952                 .rpc_argp = &args,
5953                 .rpc_resp = &res,
5954         };
5955         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5956 }
5957
5958 static int
5959 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
5960                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
5961 {
5962         struct nfs4_exception exception = { };
5963         int err;
5964         do {
5965                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
5966                 switch (err) {
5967                 case 0:
5968                 case -NFS4ERR_WRONGSEC:
5969                 case -NFS4ERR_NOTSUPP:
5970                         break;
5971                 default:
5972                         err = nfs4_handle_exception(server, err, &exception);
5973                 }
5974         } while (exception.retry);
5975         return err;
5976 }
5977
5978 static int
5979 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
5980                     struct nfs_fsinfo *info)
5981 {
5982         int err;
5983         struct page *page;
5984         rpc_authflavor_t flavor;
5985         struct nfs4_secinfo_flavors *flavors;
5986
5987         page = alloc_page(GFP_KERNEL);
5988         if (!page) {
5989                 err = -ENOMEM;
5990                 goto out;
5991         }
5992
5993         flavors = page_address(page);
5994         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
5995
5996         /*
5997          * Fall back on "guess and check" method if
5998          * the server doesn't support SECINFO_NO_NAME
5999          */
6000         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6001                 err = nfs4_find_root_sec(server, fhandle, info);
6002                 goto out_freepage;
6003         }
6004         if (err)
6005                 goto out_freepage;
6006
6007         flavor = nfs_find_best_sec(flavors);
6008         if (err == 0)
6009                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6010
6011 out_freepage:
6012         put_page(page);
6013         if (err == -EACCES)
6014                 return -EPERM;
6015 out:
6016         return err;
6017 }
6018 #endif /* CONFIG_NFS_V4_1 */
6019
6020 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6021         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6022         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6023         .recover_open   = nfs4_open_reclaim,
6024         .recover_lock   = nfs4_lock_reclaim,
6025         .establish_clid = nfs4_init_clientid,
6026         .get_clid_cred  = nfs4_get_setclientid_cred,
6027 };
6028
6029 #if defined(CONFIG_NFS_V4_1)
6030 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6031         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6032         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6033         .recover_open   = nfs4_open_reclaim,
6034         .recover_lock   = nfs4_lock_reclaim,
6035         .establish_clid = nfs41_init_clientid,
6036         .get_clid_cred  = nfs4_get_exchange_id_cred,
6037         .reclaim_complete = nfs41_proc_reclaim_complete,
6038 };
6039 #endif /* CONFIG_NFS_V4_1 */
6040
6041 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6042         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6043         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6044         .recover_open   = nfs4_open_expired,
6045         .recover_lock   = nfs4_lock_expired,
6046         .establish_clid = nfs4_init_clientid,
6047         .get_clid_cred  = nfs4_get_setclientid_cred,
6048 };
6049
6050 #if defined(CONFIG_NFS_V4_1)
6051 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6052         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6053         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6054         .recover_open   = nfs4_open_expired,
6055         .recover_lock   = nfs4_lock_expired,
6056         .establish_clid = nfs41_init_clientid,
6057         .get_clid_cred  = nfs4_get_exchange_id_cred,
6058 };
6059 #endif /* CONFIG_NFS_V4_1 */
6060
6061 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6062         .sched_state_renewal = nfs4_proc_async_renew,
6063         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6064         .renew_lease = nfs4_proc_renew,
6065 };
6066
6067 #if defined(CONFIG_NFS_V4_1)
6068 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6069         .sched_state_renewal = nfs41_proc_async_sequence,
6070         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6071         .renew_lease = nfs4_proc_sequence,
6072 };
6073 #endif
6074
6075 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6076         .minor_version = 0,
6077         .call_sync = _nfs4_call_sync,
6078         .validate_stateid = nfs4_validate_delegation_stateid,
6079         .find_root_sec = nfs4_find_root_sec,
6080         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6081         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6082         .state_renewal_ops = &nfs40_state_renewal_ops,
6083 };
6084
6085 #if defined(CONFIG_NFS_V4_1)
6086 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6087         .minor_version = 1,
6088         .call_sync = _nfs4_call_sync_session,
6089         .validate_stateid = nfs41_validate_delegation_stateid,
6090         .find_root_sec = nfs41_find_root_sec,
6091         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6092         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6093         .state_renewal_ops = &nfs41_state_renewal_ops,
6094 };
6095 #endif
6096
6097 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6098         [0] = &nfs_v4_0_minor_ops,
6099 #if defined(CONFIG_NFS_V4_1)
6100         [1] = &nfs_v4_1_minor_ops,
6101 #endif
6102 };
6103
6104 static const struct inode_operations nfs4_file_inode_operations = {
6105         .permission     = nfs_permission,
6106         .getattr        = nfs_getattr,
6107         .setattr        = nfs_setattr,
6108         .getxattr       = generic_getxattr,
6109         .setxattr       = generic_setxattr,
6110         .listxattr      = generic_listxattr,
6111         .removexattr    = generic_removexattr,
6112 };
6113
6114 const struct nfs_rpc_ops nfs_v4_clientops = {
6115         .version        = 4,                    /* protocol version */
6116         .dentry_ops     = &nfs4_dentry_operations,
6117         .dir_inode_ops  = &nfs4_dir_inode_operations,
6118         .file_inode_ops = &nfs4_file_inode_operations,
6119         .getroot        = nfs4_proc_get_root,
6120         .getattr        = nfs4_proc_getattr,
6121         .setattr        = nfs4_proc_setattr,
6122         .lookupfh       = nfs4_proc_lookupfh,
6123         .lookup         = nfs4_proc_lookup,
6124         .access         = nfs4_proc_access,
6125         .readlink       = nfs4_proc_readlink,
6126         .create         = nfs4_proc_create,
6127         .remove         = nfs4_proc_remove,
6128         .unlink_setup   = nfs4_proc_unlink_setup,
6129         .unlink_done    = nfs4_proc_unlink_done,
6130         .rename         = nfs4_proc_rename,
6131         .rename_setup   = nfs4_proc_rename_setup,
6132         .rename_done    = nfs4_proc_rename_done,
6133         .link           = nfs4_proc_link,
6134         .symlink        = nfs4_proc_symlink,
6135         .mkdir          = nfs4_proc_mkdir,
6136         .rmdir          = nfs4_proc_remove,
6137         .readdir        = nfs4_proc_readdir,
6138         .mknod          = nfs4_proc_mknod,
6139         .statfs         = nfs4_proc_statfs,
6140         .fsinfo         = nfs4_proc_fsinfo,
6141         .pathconf       = nfs4_proc_pathconf,
6142         .set_capabilities = nfs4_server_capabilities,
6143         .decode_dirent  = nfs4_decode_dirent,
6144         .read_setup     = nfs4_proc_read_setup,
6145         .read_done      = nfs4_read_done,
6146         .write_setup    = nfs4_proc_write_setup,
6147         .write_done     = nfs4_write_done,
6148         .commit_setup   = nfs4_proc_commit_setup,
6149         .commit_done    = nfs4_commit_done,
6150         .lock           = nfs4_proc_lock,
6151         .clear_acl_cache = nfs4_zap_acl_attr,
6152         .close_context  = nfs4_close_context,
6153         .open_context   = nfs4_atomic_open,
6154         .init_client    = nfs4_init_client,
6155         .secinfo        = nfs4_proc_secinfo,
6156 };
6157
6158 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6159         .prefix = XATTR_NAME_NFSV4_ACL,
6160         .list   = nfs4_xattr_list_nfs4_acl,
6161         .get    = nfs4_xattr_get_nfs4_acl,
6162         .set    = nfs4_xattr_set_nfs4_acl,
6163 };
6164
6165 const struct xattr_handler *nfs4_xattr_handlers[] = {
6166         &nfs4_xattr_nfs4_acl_handler,
6167         NULL
6168 };
6169
6170 /*
6171  * Local variables:
6172  *  c-basic-offset: 8
6173  * End:
6174  */